© copyright 2007. do not distribute or copy without permission. 1 economics economics is divided...
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© Copyright 2007. Do not distribute or copy without permission. 1
Economics
Economics is divided into three major fields
Microeconomics examines behavior of individuals and firms
Macroeconomics examines aggregate behavior of broad sectors of the economy
Econometrics statistical analysis of economic and financial data
© Copyright 2007. Do not distribute or copy without permission. 2
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
Accounting cost is the giving up of A in order to obtain B.
Opportunity cost is the failure to obtain C because you obtained B.
Economic cost is accounting cost plus opportunity cost.
Example
A firm hires a worker for $70,000 (including benefits). The firm’s weighted average cost of capital is 15%.
The explicit cost of the worker is $70,000 per year. This is what the firm gives up in order to obtain the worker.
The opportunity cost of the worker is ($70,000)(0.15) = $10,500. This is the amount of money the firm could have earned, but failed to earn, had the firm invested the $70,000 elsewhere.
The economic cost of the worker is $70,000 + $10,500 = $80,500.
© Copyright 2007. Do not distribute or copy without permission. 3
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
Example
A firm spends $100 million on building a new factory. The amortized cost of the factory is $10 million annually. The new factory will cost $8 million to operate annually. The factory is expected to bring in an additional $25 million in revenue annually.
After the factory is completed, economic conditions change such that the expected revenue to be generated by the factory drops to $5 million.
Should the firm operate or shut-down the factory (note: shutting down does not recoup the $100 million cost of the factory)?
© Copyright 2007. Do not distribute or copy without permission. 4
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
Example
Some managers will be tempted to operate the factory because of the $100 million invested. This is called the sunk cost fallacy. The sunk cost fallacy arises when one fails to make decisions at-the-margin.
A decision at-the-margin looks only at changes given current conditions. In this case, the given condition is that the factory exists. The choice to operate or not is irrelevant to the $100 million investment.
Operate the factoryAnnual profit = $5 million – $8 million – $10 million = – $13 million
Shutdown the factoryAnnual profit = $0 million – $0 million – $10 million = – $10 million
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Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
Where people are concerned, we call this utility maximization. Where firms are concerned, we call this profit maximization.
Example
Stockholders can mitigate portfolio risk by diversifying their stock holdings. Therefore, they will want to hold individual stocks that have greater expected returns and greater risks rather than individual stocks that have lesser expected returns and lesser risks.
As a result, stockholders want CEO’s to take risks in pursuit of greater profits.
© Copyright 2007. Do not distribute or copy without permission. 6
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
Problem
If a risk goes bad, the CEO will be fired CEO has incentive not to take risks.
How can stockholders motivate CEO’s to take risks?
“Golden parachute” – guarantee the CEO that, in the event the CEO is fired, CEO will receive a large lump-sum payment from the company.
© Copyright 2007. Do not distribute or copy without permission. 7
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
Other Examples
• Soviet nail manufacturers produced huge, multi-ton nails.
• In Russia, dead light bulbs sold for more than live light bulbs.
• Traffic monitoring devices reduce side-impact, but cause rear-end collisions.
© Copyright 2007. Do not distribute or copy without permission. 8
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
4. Exchange is (usually) not a zero-sum game.
Zero-sum game: A situation in which what one person gains, the other loses.
In an exchange, both parties can end up better off than they were at the outset.
Example
Person A owns a car that he would like to sell. Person A has full knowledge of the condition of the car. Given his need to drive, desire for style/comfort, etc., Person A places a subjective value of $10,000 on the car. This means that Person A would accept nothing less than $10,000 in exchange for the car.
© Copyright 2007. Do not distribute or copy without permission. 9
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
4. Exchange is (usually) not a zero-sum game.
Example
Person B also has full knowledge of the condition of the car. Given her need to drive, etc., Person B places a subjective value of $12,000 on the car. This means that Person B would pay any price up to, but not more than, $12,000 in exchange for the car.
© Copyright 2007. Do not distribute or copy without permission. 10
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
4. Exchange is (usually) not a zero-sum game.
Example
A reservation price is the minimum price the seller is willing to accept or the maximum price the buyer is willing to pay.
Seller’s reservation price = $10,000Buyer’s reservation price = $12,000
If Person B pays $11,000 for the car, Person B gains $1,000 of value ($12,000 car value less $11,000 price), and Person A gains $1,000 of value ($11,000 price less $10,000 car value).
© Copyright 2007. Do not distribute or copy without permission. 11
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
4. Exchange is (usually) not a zero-sum game.
5. The world is non-linear.
Assuming that the world is linear results in erroneous expectations.
ExampleA firm employs 100 workers who, together, produce 100,000 bottles
of beer daily.
Linear assumption: 200 workers will produce 200,000 bottles of beer daily.
Non-linear reality: Factory cannot accommodate 200 workers. Overcrowding puts downward pressure on output 200 workers produce only 140,000 bottles.
© Copyright 2007. Do not distribute or copy without permission. 12
Fundamental Principles of Economic Behavior
1. Some choices involve accounting (“explicit”) costs, but all choices involve opportunity costs.
2. People make decisions at-the-margin.
3. People respond to incentives.
4. Exchange is (usually) not a zero-sum game.
5. The world is non-linear.
Linear assumption: Double the workers and the factory size to produce 200,000 bottles of beer daily.
Non-linear reality: Managers are limited in the number of workers they can manage. Without adding an extra layer of management, inefficiencies put downward pressure on output doubled workers and factory space produce only 180,000 bottles.
© Copyright 2007. Do not distribute or copy without permission. 13
Terminology
Product A good or service.
Good An object that is desirable.
Durable good A good that is consumed over a long period of time.
Service An action that is desirable.
Attributes Color, taste, smell, size, price, durability, etc. Salient attributes are attributes that are important to the consumer.
Brand A variety of a product identified from other varieties by a commercial name and/or other distinctive attributes.
Consumer One who desires to purchase a product.
End-user A consumer who will not resell a product.
Producer One who offers a product for sale.
Manufacturer One who creates a product.
Retailer One who sells, but does not manufacture, a product.
Factor Labor, materials, capital a producer uses to produce a product.
Capital Buildings, land, machinery used in the production of a product. Also called property, plant, and equipment (PP&E).
Market Interaction of consumers and producers of a given product.
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Markets
A market forms when consumers and producers of a product come together.
The behavior of the consumer is summarized by demand.
The behavior of the producer is summarized by supply.
Later, we will examine instances in which markets are influenced by government intervention and foreign competition. For the moment, we will focus on the simple case in which the only players in the market are the producers and consumers.
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Demand
The relationship between the number of units of a product a consumer is willing to buy and the price of the product.
Demand
Price per Unit Quantity Demanded
(per unit time) $20 100 $18 120 $16 150
Relationship between price and quantity is demand.
Amount the consumer wants to buy is quantity demanded.
Incorrect: “When the price of the product falls, demand rises.”
Correct: “When the price of the product falls, the quantity demanded rises.”
© Copyright 2007. Do not distribute or copy without permission. 16
Demand
The relationship between the number of units of a product a consumer is willing to buy and the price of the product.
Demand
Price per Unit Quantity Demanded
(per unit time) $20 100 $18 120 $16 150
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity Demanded per Unit Time
Pri
ce p
er U
nit
Figures from the table can be plotted to form a graph of demand.
© Copyright 2007. Do not distribute or copy without permission. 17
$15
$16
$17
$18
$19
$20
$21
100 110 120 130 140 150 160
Quantity Demanded per Unit Time
Pri
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nit
Price per Unit Quantity Demanded
(per unit time) $20 100 $18 120 $16 150
Any event that alters the demand relationship is called a consumer shock.
A positive consumer shock causes consumers to want to purchase more units of the product at all price levels.
A negative consumer shock causes consumers to want to purchase fewer units of the product at all price levels.
Demand
$15
$16
$17
$18
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$20
$21
100 110 120 130 140 150 160
Quantity Demanded per Unit Time
Pri
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nit
Price per Unit Quantity Demanded
(per unit time) $20 100 110 $18 120 133 $16 150 166
160
Positive Consumer Shock
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Price per Unit Quantity Demanded
(per unit time) $20 100 $18 120 $16 150
A change in the price of a good is not a shock because the price change does not alter the relationship between price and quantity demanded.
When the price falls, consumers want to buy more of the product, but they don’t want to buy more of the product at all price levels.
Demand
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity Demanded per Unit Time
Pri
ce p
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nit
If price had stayed at $20, consumers would not want to buy
more.
© Copyright 2007. Do not distribute or copy without permission. 19
Demand
Typical Consumer Shocks
1. Change in consumers’ purchasing power.Increase (decrease) in purchasing power is a positive (negative) shock.
2. Change in price of a substitute product.Increase (decrease) in price of a substitute is a positive (negative) shock. E.g. increase in price of coffee increases demand for tea.
3. Change in price of a complement product.Increase (decrease) in price of a complement is a negative (positive) shock. E.g. increase in price of charcoal decreases demand for lighter fluid.
4. Change in consumer preferences.Increase (decrease) in preferences is a positive (negative) shock.
5. Change in number of consumers.Increase (decrease) in number of consumers is a positive (negative) shock.
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Price per Unit Quantity Supplied
(per unit time) $20 140 $18 120 $16 100
Supply
The relationship between the number of units of a product a producer is willing to offer and the price of the product.
Supply
Relationship between price and quantity is supply.
Amount the producer wants to sell is quantity supplied.
Incorrect: “When the price of the product falls, supply falls.”
Correct: “When the price of the product falls, the quantity supplied falls.”
© Copyright 2007. Do not distribute or copy without permission. 21
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150
Quantity Supplied per Unit Time
Pri
ce p
er U
nit
Supply
The relationship between the number of units of a product a producer is willing to offer and the price of the product.
Supply
Figures from the table can be plotted to form a graph of demand.
Price per Unit Quantity Supplied
(per unit time) $20 140 $18 120 $16 100
© Copyright 2007. Do not distribute or copy without permission. 22
$15
$16
$17
$18
$19
$20
$21
100 110 120 130 140 150 160
Quantity Supplied per Unit Time
Pri
ce p
er U
nit
Price per Unit Quantity Supplied
(per unit time) $20 140 $18 120 $16 100
Supply
Any event that alters the supply relationship is called a producer shock.
A positive producer shock causes producers to want to offer more units of the product at all price levels.
A negative producer shock causes producers to want to offer fewer units of the product at all price levels.
Price per Unit Quantity Supplied
(per unit time) $20 140 160 $18 120 133 $16 100 110
$15
$16
$17
$18
$19
$20
$21
100 110 120 130 140 150 160
Quantity Supplied per Unit Time
Pri
ce p
er U
nit
Positive Producer Shock
© Copyright 2007. Do not distribute or copy without permission. 23
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150
Quantity Supplied per Unit Time
Pri
ce p
er U
nit
Price per Unit Quantity Supplied
(per unit time) $20 140 $18 120 $16 100
Supply
A change in the price of a good is not a shock because the price change does not alter the relationship between price and quantity supplied.
When the price falls, producers want to offer fewer units of the product, but they don’t want to offer fewer units at all price levels.
If price had stayed at $20, producers would not want to
offer fewer units.
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Supply
Typical Producer Shocks
1. Change in producers’ technology.Increase (decrease) in technology is a positive (negative) shock.
2. Change in prices of factors.Increase (decrease) in price of a factor is a negative (positive) shock. E.g. increase in price of steel decreases supply of cars.
3. Change in the number of producers.Increase (decrease) in number of producers is a positive (negative) shock.
© Copyright 2007. Do not distribute or copy without permission. 25
Identifying Shocks
First
Identify the market under scrutiny, and the consumers/producers of the market’s product.
Consumer Shocks vs. Producer Shocks
A shock is a consumer shock if it impacts consumers first and producers (if at all) only as a result of the impact on consumers.
A shock is a producer shock if it impacts producers first and consumers (if at all) only as a result of the impact on producers.
Positive Shocks vs. Negative Shocks
A shock is a positive shock if it makes it easier or more attractive for producers/consumers to produce/consume.
A shock is a negative shock if it makes it harder or less attractive for producers/consumers to produce/consume.
© Copyright 2007. Do not distribute or copy without permission. 26
Identifying Shocks
Example
Refusing entry visas to Canadian loggers who, previously, cut trees in Maine for use as pulpwood is what sort of shock to the American paper markets?1. Identify the market
Market for American-made paper
2. Identify the producersAmerican paper manufacturers
3. Identify the consumersThose who buy American paper
4. Identify the target of the shock (consumer shock or producer shock)Producer shock
5. Identify the direction of the shock (positive or negative)Negative shock
6. Identify the impact on demand/supplySupply of paper decreases
© Copyright 2007. Do not distribute or copy without permission. 27
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
ce p
er U
nit
Shortage, Surplus, and Equilibrium
Suppose the price of a product is $16.
According to the supply curve, producers will offer 100 units per day.
According to the demand curve, consumers will seek to purchase 150 units per day.
A shortage is a situation in which QD >
QS
Shortage = 50 units per day
© Copyright 2007. Do not distribute or copy without permission. 28
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
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nit
Shortage, Surplus, and Equilibrium
Producers experience a shortage as a reduction in inventories (for goods producers) or limited capacity (for service producers).
Competition by consumers for a limited quantity of product puts upward pressure on price.
As price rises, QS increases and QD
decreases, reducing the shortage.
© Copyright 2007. Do not distribute or copy without permission. 29
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
ce p
er U
nit
Shortage, Surplus, and Equilibrium
Eventually, the price rises to a point such that the shortage is completely eliminated.With the shortage gone, consumers no longer compete for a limited quantity of product, and so the price stops rising.
Equilibrium point
Equilibrium quantity
Equilibrium price
© Copyright 2007. Do not distribute or copy without permission. 30
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
ce p
er U
nit
Shortage, Surplus, and Equilibrium
Suppose the price of a product is $20.
According to the demand curve, consumers will seek to purchase 100 units per day.According to the supply curve, producers will offer 140 units per day.
A surplus is a situation in which QD <
QS
Surplus = 40 units per day
© Copyright 2007. Do not distribute or copy without permission. 31
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
ce p
er U
nit
Shortage, Surplus, and Equilibrium
Producers experience a surplus as an increase in inventories (for goods producers) or excess capacity (for service producers).
Competition by producers for a limited quantity of sales puts downward pressure on price.
As price falls, QD increases and QS
decreases, reducing the surplus.
© Copyright 2007. Do not distribute or copy without permission. 32
$15
$16
$17
$18
$19
$20
$21
90 100 110 120 130 140 150 160
Quantity per Unit Time
Pri
ce p
er U
nit
Shortage, Surplus, and Equilibrium
Eventually, the price falls to a point such that the surplus is completely eliminated.With the surplus gone, producers no longer compete for a limited quantity of sales, and so the price stops falling.
Equilibrium point
Equilibrium quantity
Equilibrium price
© Copyright 2007. Do not distribute or copy without permission. 33
Shortage, Surplus, and Equilibrium
Shortage
QD > QS Competition among consumers causes price to rise
Surplus
QD < QS Competition among producers causes price to fall
Equilibrium
QD = QS No competition and so no price change
© Copyright 2007. Do not distribute or copy without permission. 34
In regression analysis, we look at how one variable (or a group of variables) can affect another variable.
We use a technique called “ordinary least squares” or OLS. The OLS technique looks at a sample of two (or more) variables and filters out random noise so as to find the underlying deterministic relationship among the variables.
Example:
A retailer suspects that monthly sales follow unemployment rate announcements with a one-month lag. When the Bureau of Labor Statistics announces that the unemployment rate is up, one month later, sales appear to fall. When the BLS announces that the unemployment rate is down, one month later, sales appear to rise.
The retailer wants to know if this relationship actually exists. If so, the retailer can use BLS announcements to help predict future sales.
In linear regression analysis, we assume that the relationship between the two variables (in this example, sales and unemployment rate) is linear and that any deviation from the linear relationship must be due to noise (i.e. unaccounted randomness in the data).
Regression Analysis
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Example:
The chart below shows data (see Data Set #4) on sales and the unemployment rate collected over a 10 month period.
Notice that the relationship (if there is one) between the unemployment rate and sales is subject to some randomness.
Over some months (e.g. May to June), an increase in the previous month’s unemployment rate corresponds to a decrease in the current month’s sales.
But, over other months (e.g. June to July), an increase in the previous month’s unemployment rate corresponds to an increase in the current month’s sales.
Date Montly Sales Unemployment Rate(current month) (current month) (previous month)
January $257,151 4.5%February $219,202 4.7%
March $222,187 4.6%April $267,041 4.4%May $265,577 4.8%June $192,566 4.9%July $197,655 5.0%
August $200,370 4.9%September $203,730 4.7%
October $181,303 4.8%
Regression Analysis
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Example:
It is easier to picture the relationship between unemployment and sales if we graph the data. Since we are hypothesizing that changes in the unemployment rate cause changes in sales, we put unemployment on the horizontal axis and sales on the vertical axis.
$160,000
$180,000
$200,000
$220,000
$240,000
$260,000
$280,000
4.3% 4.4% 4.5% 4.6% 4.7% 4.8% 4.9% 5.0% 5.1%
Unemployment Rate (previous month)
Sal
es (
curr
ent
mo
nth
)
Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 37
y = -11,648,868x + 771,670
$160,000
$180,000
$200,000
$220,000
$240,000
$260,000
$280,000
4.3% 4.4% 4.5% 4.6% 4.7% 4.8% 4.9% 5.0% 5.1%
Unemployment Rate (previous month)
Sal
es (
curr
ent
mo
nth
)
Example:
OLS finds the line that most closely fits the data. Because we have assumed that the relationship is linear, two numbers describe the relationship: (1) the slope, and (2) the vertical intercept.
Vertical intercept = 771,670
Slope = –11,648,868
^
Sales 771,670 11,648,868 (unemp rate)
Regression Analysis
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y = -11,648,868x + 771,670
$160,000
$180,000
$200,000
$220,000
$240,000
$260,000
$280,000
4.3% 4.4% 4.5% 4.6% 4.7% 4.8% 4.9% 5.0% 5.1%
Unemployment Rate (previous month)
Sal
es (
curr
ent
mo
nth
)
The graph below shows two relationships:1. The regression model is the scattering of dots and represents the actual
data.2. The estimated (or fitted) regression model is the line and represents the
regression model after random noise has been removed.
1Sales (unemp rate )t t tu
^
1ˆSales (unemp rate )ˆt t
Regression model
Estimated regression model
True intercept and slope
Noise (also called “error term”)
Unemp rate of 4.5%…
…is observed with sales of $257,151
After eliminating noise, we estimate that sales should have been 771,670 – (11,648,868)(0.045) = $247,471
^
Estimated noise associated with this observation
ˆSales Sales $257,151 $247,471 $9,680 tu
^
Sales 771,670 11,648,868 (unemp rate)
Estimated intercept, slope, and sales after estimating and removing noise
Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 39
Terminology:
Variables on the right hand side of the regression equation are called exogenous, or explanatory, or independent variables. They usually represent variables that are assumed to influence the left hand side variable.
The variable on the left hand side of the regression equation is called the endogenous, or outcome, or dependent variable. The dependent variable is the variable whose behavior you are interested in analyzing.
The intercept and slopes of the regression model are called parameters. The intercept and slopes of the estimated (or fitted) regression model are called estimated parameters.
The noise term in the regression model is called the error or noise. The estimated error is called the residual, or estimated error.
Y X u ˆu Y Y ˆ ˆˆY X
Regression model Fitted (estimated) model
Explanatory variable
Outcome variable
ParametersParameter estimates
Fitted (estimated) outcome variable Residual (estimated
error)
Error (noise)
Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 40
y = -11,648,868x + 771,670
$160,000
$180,000
$200,000
$220,000
$240,000
$260,000
$280,000
4.3% 4.4% 4.5% 4.6% 4.7% 4.8% 4.9% 5.0% 5.1%
Unemployment Rate (previous month)
Sal
es (
curr
ent
mo
nth
)OLS estimates the regression model parameters by selecting parameter values that minimize the variance of the residuals.
= Residual difference between actual and fitted values of the outcome variable.
Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 41
y = -11,648,868x + 771,670
$160,000
$180,000
$200,000
$220,000
$240,000
$260,000
$280,000
4.3% 4.4% 4.5% 4.6% 4.7% 4.8% 4.9% 5.0% 5.1%
Unemployment Rate (previous month)
Sal
es (
curr
ent
mo
nth
)OLS estimates the regression model parameters by selecting parameter values that minimize the variance of the residuals.
= Residual difference between actual and fitted values of the outcome variable.
Choosing different parameter values moves the estimated regression line away (on average) from the data points. This results in increased variance in the residuals.
Regression Analysis
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To perform regression in Excel: (1) Select TOOLS, then DATA ANALYSIS(2) Select REGRESSION
Regression Analysis
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To perform regression in Excel: (3) Enter the range of cells containing outcome (“Y”) and
explanatory (“X”) variables(4) Enter a range of cells for the output
Constant is zeroCheck this box to force the vertical intercept to be zero.
Confidence levelExcel automatically reports 95% confidence intervals. Check this box and enter a level of confidence if you want a different confidence interval.
ResidualsCheck this box if you want Excel to report the residuals.
Standardized residualsCheck this box if you want Excel to report the residuals in terms of standard deviations from the mean.
Regression Analysis
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Regression results
Vertical intercept estimate
Slope estimate
Standard deviation of vertical intercept estimate
Standard deviation of slope estimate
Test statistic and p-value for H0: parameter =
0
95% confidence interval around parameter
estimate
Regression Analysis
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The properties of a regression parameter estimates:
Population parameter
Standard deviation of varies depending on the regression mode
ˆ is distributed , where = number of parameters in the regression modelN kt k
If we select a different sample of observations from a population and then perform OLS, we will obtain slightly different parameter estimates.
Thus, regression parameter estimates are random variables.
ˆLet be a regression parameter estimate.
Distribution of Regression Parameter Estimates
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Regression demoEnter population values here.
Spreadsheet selects a sample from the population and calculates parameter estimates based on the sample.
Press F9 to select a new sample.
Distribution of Regression Parameter Estimates
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In multiple regression analysis the OLS technique finds the linear relationship between an outcome variable and a group of explanatory variables.
As in simple regression analysis, OLS filters out random noise so as to find the underlying deterministic relationship. OLS also identifies the individual effects of each of the multiple explanatory variables.
0 1t t tY X u
Simple regression
0 1 1, 2 2, ,...t t t m m t tY X X X u
Multiple regression
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 48
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Approach #1: Calculate Average Time per Mile
Trucks in the data set required a total of 87 hours to travel a total of 4,000 miles. Dividing hours by miles, we find an average of 0.02 hours per mile journeyed.
Problem:
This approach ignores a possible fixed effect. For example, if travel time is measured starting from the time that out-bound goods begin loading, then there will be some fixed time (the time it takes to load the truck) tacked on to all of the trips. For longer trips this fixed time will be “amortized” over more miles and will have less of an impact on the time/mile ratio than for shorter trips.
This approach also ignores the impact of the number of deliveries.
Miles Traveled Deliveries Travel Time (hours)
500 4 11.3250 3 6.8500 4 10.9500 2 8.5250 2 6.2400 2 8.2375 3 9.4325 4 8450 3 9.6450 2 8.1
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 49
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Approach #2: Calculate Average Time per Mile and Average Time per Delivery
Trucks in the data set averaged 87 / 4,000 = 0.02 hours per mile journeyed,and 87 / 29 = 3 hours per delivery.
Problem:
Like the previous approach, this approach ignores a possible fixed effect.
This approach does account for the impact of both miles and deliveries, but the approach ignores the possible interaction between miles and deliveries. For example, trucks that travel more miles likely also make more deliveries. Therefore, when we combine the time/miles and time/delivery measures, we may be double-counting time.
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 50
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Approach #3: Regress Time on Miles
The regression model will detect and isolate any fixed effect.
Problem:
The model ignores the impact of the number of deliveries. For example, a 500 mile journey with 4 deliveries will take longer than a 500 mile journey with 1 delivery.
Miles Traveled Deliveries Travel Time (hours)
500 4 11.3250 3 6.8500 4 10.9500 2 8.5250 2 6.2400 2 8.2375 3 9.4325 4 8450 3 9.6450 2 8.1
0 1Time (miles )i i iu
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 51
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Approach #4: Regress Time on Deliveries
The regression model will detect and isolate any fixed effect and will account for the impact of the number of deliveries.
Problem:
The model ignores the impact of miles traveled. For example, a 500 mile journey with 4 deliveries will take longer than a 200 mile journey with 4 deliveries.
Miles Traveled Deliveries Travel Time (hours)
500 4 11.3250 3 6.8500 4 10.9500 2 8.5250 2 6.2400 2 8.2375 3 9.4325 4 8450 3 9.6450 2 8.1
0 1Time (deliveries )i i iu
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 52
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Approach #5: Regress Time on Both Miles and Deliveries
The multiple regression model (1) will detect and isolate any fixed effect, (2) will account for the impact of the number of deliveries, (3) will account for the impact of miles, and (4) will eliminate out the overlapping effects of miles and deliveries.
Miles Traveled Deliveries Travel Time (hours)
500 4 11.3250 3 6.8500 4 10.9500 2 8.5250 2 6.2400 2 8.2375 3 9.4325 4 8450 3 9.6450 2 8.1
0 1 2Time (miles ) (deliveries )i i i iu
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 53
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
0 1 2
Regression model:
Time (miles ) (deliveries )i i i iu
SUMMARY OUTPUT
Regression StatisticsMultiple R 0.950678166R Square 0.903788975Adjusted R Square 0.876300111Standard Error 0.573142152Observations 10
ANOVAdf SS MS F Significance F
Regression 2 21.60055651 10.80027826 32.87836743 0.00027624Residual 7 2.299443486 0.328491927Total 9 23.9
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept 1.131298533 0.951547725 1.188903619 0.273240329 -1.118752683 3.38134975X Variable 1 0.01222692 0.001977699 6.182396959 0.000452961 0.007550408 0.016903431X Variable 2 0.923425367 0.221113461 4.176251251 0.004156622 0.400575489 1.446275244
^
0 1 2
0
1
2
2
Estimated regression model:
ˆ ˆ ˆTime (miles ) (deliveries )
ˆ 1.13 (0.952) [0.2732]
ˆ 0.01 (0.002) [0.0005]
ˆ 0.92 (0.221) [0.0042]
0.90
i i i
R
Standard deviations of parameter estimates and p-values are typically shown in parentheses and brackets, respectively, near the parameter estimates.
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 54
Example:
A trucking company wants to be able to predict the round-trip travel time of its trucks. Data Set #6 contains historical information on miles traveled, number of deliveries per trip, and total travel time. Use the information to predict a truck’s round-trip travel time.
Notes on results:1. Constant is not significantly
different from zero.2. Slope coefficients are
significantly different from zero.
3. Variation in miles and deliveries, together, account for 90% of the variation in time.
^
0 1 2
0
1
2
2
Estimated regression model:
ˆ ˆ ˆTime (miles ) (deliveries )
ˆ 1.13 (0.952) [0.2732]
ˆ 0.01 (0.002) [0.0005]
ˆ 0.92 (0.221) [0.0042]
0.90
i i i
R
The parameter estimates are measures of the marginal impact of the explanatory variables on the outcome variable.
Marginal impact measures the impact of one explanatory variable after the impacts of all the other explanatory variables are filtered out.Marginal impacts of explanatory
variables
0.01 = increase in time given increase of 1 mile traveled.
0.92 = increase in time given increase of 1 delivery.
Multiple Regression Analysis
© Copyright 2007. Do not distribute or copy without permission. 55
Types of Analysis
A qualitative analysis attempts to determine the direction of changes in price and quantity.
A quantitative analysis attempts to determine the magnitude of changes in price and quantity.
© Copyright 2007. Do not distribute or copy without permission. 56
Qualitative Analysis of Shocks
Example
In March 2005, crude oil rose to a then-record $56 per barrel. Crude oil is the main component of gasoline. Using qualitative analysis, determine the impact of the rise in oil prices on the market for gasoline.
Incorrect approach
The increase in the price of oil will cause an increase in the price of gas. As gas prices rise, it becomes more profitable for retailers to sell gasoline, so the quantity of gas offered for sale will rise. Because people won’t drive less, consumers will not buy less gas, but will cut back on purchases of other things. In summary: The price of gas will rise and the quantity of gas sold will rise.Critique of Analysis
The analysis skips the impact of the price of oil on the demand and supply of gasoline, and instead jumps right to the impact on the price of gas. While the analysis correctly identifies the impact on the price of gas, by skipping the impact on demand and supply, the analysis fails to identify why the price of gas is rising and, as a result, incorrectly concludes that sales of gas will rise.
© Copyright 2007. Do not distribute or copy without permission. 57
Qualitative Analysis of Shocks
Correct approach
1. The rise in the price of oil is a negative producer shock.
Q/time
$/unit
D
S
2. Negative producer shock causes supply of gasoline to decrease.
S’
P1
Market for Gasoline
3. Decrease in supply of gasoline causes a shortage of gasoline.
QDQS
shortage
4. Shortage of gasoline causes price of gasoline to rise.
P2
5. Price rises until new equilibrium is attained.
A
B
End result:Market moves from equilibrium A to equilibrium B
Price of gasoline rises and quantity sold of gasoline falls.
© Copyright 2007. Do not distribute or copy without permission. 58
Qualitative Analysis of ShocksPublicity surrounding the introduction of the new food pyramid has raised consumer awareness of the health problems associated with eating fast food. Simultaneously, Congress voted to increase the minimum wage effective immediately. Using qualitative analysis, determine the combined impact of these shocks on the market for fast food.1. Identify the market
Market for fast food
2. Identify the producersFast food retailers
3. Identify the consumersPeople who buy fast food
4. Identify the target of the shock (consumer shock or producer shock)Publicity: consumer shockMinimum wage: producer shock
5. Identify the direction of the shock (positive or negative)Publicity: negative shockMinimum wage: negative shock
6. Identify the impact on demand/supplyPublicity: demand decreasesMinimum wage: supply decreases
© Copyright 2007. Do not distribute or copy without permission. 59
Qualitative Analysis of Shocks
Perform qualitative analysis (skip intermediate steps – focus on change in equilibrium)
Q/time
$/unit
D
S
P1
Market for Fast Food
Q1
A
3. New equilibrium at B price rises to P2 and quantity sold falls to Q2.
Q2
P2
B
End result:Price of fast food rises and quantity sold of fast food falls.
2. Demand decreases and supply decreases.
S’
D’
1. Market starts at equilibrium A price is P1 and quantity sold per unit time
is Q1.
Question:What is wrong with this analysis?
Analysis assumes that the producer shock was larger than the consumer shock.
© Copyright 2007. Do not distribute or copy without permission. 60
Qualitative Analysis of Shocks
Perform qualitative analysis (skip intermediate steps – focus on change in equilibrium)
Q/time
$/unit
D
S
P1
Market for Fast Food
Q1
A
End result:Price of fast food falls and quantity sold of fast food falls.
We looked at two possibilities (1) consumer shock is greater than producer shock, and (2) producer shock is greater than consumer shock.
In both cases, quantity sold fell, but in case (1) price rose while in case (2) price fell.
1. Market starts at equilibrium A price is P1 and quantity sold per unit time is Q1.2. Demand decreases and supply decreases (but, this time, demand shift is
greater).
S’
D’
Assume now that the consumer shock is larger than the producer shock.
Conclusion: Quantity sold will fall. Impact on price is unknown.
Q2
P2
B
3. New equilibrium at B price falls to P2 and quantity sold falls to Q2.
© Copyright 2007. Do not distribute or copy without permission. 61
Quantitative Analysis of Shocks
In a quantitative analysis, we apply regression techniques to data in an attempt to estimate the parameters of the demand and supply functions.
Ordinary Least Squares
One might be tempted to use OLS to estimate the demand (or supply) function. One problem with using OLS is that we don’t know if different observations are due to shifts in demand or supply.
D
S
••••
S’S’’
S’’’
Data on P and Q show demand, but not supply.
D
S
••••
D’ D’’
D’’’
Data on P and Q show supply, but not demand.
© Copyright 2007. Do not distribute or copy without permission. 62
Quantitative Analysis of ShocksWe employ a procedure called two-stage least squares in an attempt to account for the fact that we don’t know whether the price and quantity data were generated by changes in supply, demand, or both together.
Two-Stage Least Squares
1. Identify factors that could cause shifts in demand and supply (over the sample period represented in the data set). Example: Consumer Income, Prices of Substitutes/Complements, Prices of Factors, Number of Producers, etc.
2. Run an OLS regression of quantity on all of the factors that could cause shifts in either demand or supply. This is stage #1 of the TSLS procedure.
3. Using the parameter estimates from stage #1, calculate fitted values for quantity.
4. Run an OLS regression of price on the fitted values for quantity and the factors that could cause shifts in demand. The results from this regression comprise the estimated demand function. This is stage #2 (as applied to demand).
5. Run an OLS regression of price on the fitted values for quantity and the factors that could cause shifts in supply. The results from this regression comprise the estimated supply function. This is stage #2 (as applied to supply).
© Copyright 2007. Do not distribute or copy without permission. 63
Quantitative Analysis of ShocksExample
Using the following data, estimate the demand and supply functions.
Qt Quantity (units) sold at time t
Pt Price per unit at time t
It Customers’ average incomes at time t
Ft Average prices of factors at time t
St Price of primary substitute at time t
Ct Price of primary complement at time t
1. Factors that could cause a shift in demand or supply: I, F, S, C
1 2 3 4t t t t t tQ I F S C u
2. Regress quantity sold on factors that could shift demand or supply.
© Copyright 2007. Do not distribute or copy without permission. 64
Quantitative Analysis of Shocks
1. Factors that could cause a shift in demand or supply: I, F, S, C
1 2 3 4t t t t t tQ I F S C u
2. Regress quantity sold on factors that could shift demand or supply.
3. Using parameter estimates, calculate fitted quantities.
1 2 3 4ˆ ˆ ˆ ˆ ˆˆt t t t tQ I F S C
1 2 3 4
1 2 3 4
ˆ
ˆ ˆ ˆ ˆDemand equation is: ˆ
t t t t t t
t t t t t
P Q I S C u
P Q I S C
4. Regress price on fitted quantity sold and factors that could shift demand. Regress price on fitted quantity sold and factors that could shift supply.
1 2
1 2
ˆ
ˆ ˆSupply equation is: ˆ
t t t t
t t t
P Q F u
P Q F
© Copyright 2007. Do not distribute or copy without permission. 65
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.
1 2 3 4t t t t t tQ MAHI LC CPPU AB u
1. What factors could cause changes in demand or supply?
Household income (MAHI), Labor costs (LC), Competitor price per unit (CPPU), Advertising budget (AB)
2. Regress output on these factors then calculate fitted output.
© Copyright 2007. Do not distribute or copy without permission. 66
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.2. Regress output on these factors then calculate fitted output.
© Copyright 2007. Do not distribute or copy without permission. 67
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.2. Regress output on these factors then calculate fitted output.
Dependent variable
Independent variable(s)
© Copyright 2007. Do not distribute or copy without permission. 68
SUMMARY OUTPUT
Regression StatisticsMultiple R 0.999283462R Square 0.998567438Adjusted R Square 0.998403717Standard Error 261.5251211Observations 40
ANOVAdf SS MS F Significance F
Regression 4 1668625705 4.17E+08 6099.189 3.15186E-49Residual 35 2393838.615 68395.39Total 39 1671019544
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept -474.5638082 602.9004286 -0.787135 0.436501 -1698.518244 749.3906274Median Income 0.169918856 0.005828559 29.15281 3.85E-26 0.158086238 0.181751475Labor Costs -0.067582498 0.003374014 -20.0303 9.34E-21 -0.074432119 -0.060732878Competitor Price 90.76936788 53.69585291 1.690435 0.099833 -18.23914202 199.7778778Advertising Budget 0.462282487 0.003017196 153.2159 4.48E-51 0.456157247 0.468407728
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.2. Regress output on these factors then calculate fitted output.
1 2 3 4ˆ ˆ ˆ ˆ ˆˆQ MAHI LC CPPU AB
ˆ 474.56 0.17 0.07
90.77 0.46
Q MAHI LC
CPPU AB
© Copyright 2007. Do not distribute or copy without permission. 69
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.2. Regress output on these factors then calculate fitted output.
ˆ 474.56 0.17 0.07
90.77 0.46
Q MAHI LC
CPPU AB
9936 850424765 2391413396 1144318889 2234123004 124727317 18385
15999 1305826254 2192519429 1114815518 197428025 114747521 13264
22670 519021715 1948826640 1511713372 2132025071 1219310543 64668940 15521
26480 4865
Fitted Unit Sales
Note: The figures shown in the equation are rounded to two decimal places. The figures on the right are calculated using the non-rounded coefficients.
© Copyright 2007. Do not distribute or copy without permission. 70
Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the demand equation faced by the firm as a whole.3. Regress price on fitted quantity and factors that could shift demand.
1 2 3 4ˆ
t t t t t tP Q MAHI CPPU AB u SUMMARY OUTPUT
Regression StatisticsMultiple R 0.991419686R Square 0.982912994Adjusted R Square 0.980960194Standard Error 2.952486265Observations 40
ANOVAdf SS MS F Significance F
Regression 4 17550.63891 4387.659727 503.3350432 2.14659E-30Residual 35 305.10113 8.717175143Total 39 17855.74004
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept 0.487756046 7.013101584 0.069549263 0.944948276 -13.74961448 14.72512657Fitted Quantity Sold -0.001273075 0.000563621 -2.25874303 0.030234817 -0.002417287 -0.000128862Median Income 0.000501297 0.000119796 4.184601716 0.000182421 0.000258099 0.000744496Competitor Price -0.0143109 0.609609764 -0.02347551 0.981404306 -1.251886027 1.223264226Advertising Budget 0.002112162 0.000262718 8.03964832 1.83457E-09 0.001578815 0.002645509
ˆˆ 0.4878 0.0013 0.0005
0.0143 0.0021
t t t
t t
P Q MAHI
CPPU AB
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Quantitative Analysis of Shocks
Data Set #1 contains monthly data relevant to a firm’s 40 retail locations. Using this data, estimate the supply equation faced by the firm as a whole.4. Regress price on fitted quantity and factors that could shift supply.
1 2 3ˆ
t t t t tP Q LC AB u SUMMARY OUTPUT
Regression StatisticsMultiple R 0.991369183R Square 0.982812858Adjusted R Square 0.981380596Standard Error 2.919708628Observations 40
ANOVAdf SS MS F Significance F
Regression 3 17548.8509 5849.616965 686.1963487 8.29996E-32Residual 36 306.889145 8.524698471Total 39 17855.74004
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept 0.408493319 5.869001067 0.069601848 0.944895759 -11.49437686 12.3113635Fitted Quantity Sold 0.001590068 0.000332424 4.783254098 2.90824E-05 0.000915882 0.002264255Labor Cost 0.000193847 4.55408E-05 4.256551323 0.000141656 0.000101486 0.000286208Advertising Budget 0.000787492 0.000153962 5.114837906 1.05727E-05 0.000475243 0.001099742
ˆˆ 0.4085 0.0016 0.0002
0.0008
t t t
t
P Q LC
AB
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Quantitative Analysis of Shocks
The firm is going to open a new retail store and is faced with a choice between two locations. Location A is in a higher income area (median household income = $80,000) while location B is in a lower income area (median household income = $40,000). This means, in part, that the firm would have to pay a higher wage to its workers if it located at A versus B. The firm is willing to spend, for labor costs plus advertising combined, a total of $200,000 per month.
The firm estimates that its monthly labor costs at location A would be $150,000 while its monthly labor costs at location B would be $100,000.
Suppose the firm wants to sell 15,000 units per month. Using your estimate of the demand curve, provide a recommendation as to which location the firm should choose. Assume that the competition price is the average of the prices observed at the firm’s 40 locations.
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021t t t t tP Q MAHI CPPU AB
Location A
ˆ 0.4878 0.0013 15,000 0.0005 $80,000 0.0143 $7.58 0.0021 $50,000
$125.88tP
© Copyright 2007. Do not distribute or copy without permission. 73
Quantitative Analysis of Shocks
Suppose the firm wants to sell 15,000 units per month. Using your estimate of the demand curve, provide a recommendation as to which location the firm should choose. Assume that the competition price is the average of the prices observed at the firm’s 40 locations.
Location A
ˆ 0.4878 0.0013 15,000 0.0005 $80,000 0.0143 $7.58 0.0021 $50,000
$125.88tP
Location B
ˆ 0.4878 0.0013 15,000 0.0005 $40,000 0.0143 $7.58 0.0021 $100,000
$210.88tP
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021t t t t tP Q MAHI CPPU AB
For the same cost and generating the same unit sales, the firm will be able to charge more for its product at location B.
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Elasticities
The information contained in the estimated demand and supply functions can be summarized in elasticities. An elasticity is a number that indicates the sensitivity of an outcome to a factor.
%%
QX
An elasticity is defined as the percentage change in quantity (either demanded or supplied) divided by the percentage change in a factor.
Q Q XX X Q
%%
The elasticity can be rewritten as:
The ratio of the change in Q to a change in X can be derived from the coefficients in the demand and supply equations.
© Copyright 2007. Do not distribute or copy without permission. 75
Elasticities
A different elasticity can be constructed corresponding to each factor in the demand and supply equations. Typical elasticities include:
From the demand equation
Price elasticity of demand
Cross-price elasticity of demand
Income elasticity of demand
Advertising elasticity of demand
From the supply equation
Price elasticity of supply
Labor cost elasticity of supply
%%
dQPrice
%%
dQPrice of Other Product
%%
dQIncome
%%
dQAdvertising
%%
sQPrice
%%
sQLabor Cost
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Elasticities
Continuing with the demand equation derived from Data Set #1, calculate the price elasticity of demand for Store Location #10.
d dQ Q PP Q
%Price Elasticity of Demand
% Price
t t t t tP Q MAHI CPPU AB
Demand Equation
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021
d
PQ
0.0013
Use “appropriate” values for P and Q.
Examples: most current values, average values
© Copyright 2007. Do not distribute or copy without permission. 77
Elasticities
Continuing with the demand equation derived from Data Set #1, calculate the price elasticity of demand for Store Location #10.
d
P
Q
For Store Location #10
$78.33
15,931
Price Elasticity of Demand
11 78.33
3.80.0013 15,931
d
d d
d
Q P PP Q QP
Q
“At current price and unit sales levels, every 1% rise (fall) in price results in a 3.8% fall (rise) in unit sales.”
We say, “at current price…” because, as price and quantity change, the elasticity changes.
© Copyright 2007. Do not distribute or copy without permission. 78
Elasticities
Continuing with the demand equation derived from Data Set #1, calculate the advertising elasticity of demand for Store Location #10.
d dQ QQ
% AdvertisingAdvertising Elasticity of Demand
% Advertising Advertising
t t t t tP Q MAHI CPPU AB
Demand Equation
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021
1. Calculate ΔQd/ΔAdvertising
11
1 0.0021 1 1.6150.0013
d
d
Q PP
AB AB Q
1.615
AdvertisingdQ
Multiply by 1 because we are multiplying
two effects together.
© Copyright 2007. Do not distribute or copy without permission. 79
Elasticities
Continuing with the demand equation derived from Data Set #1, calculate the advertising elasticity of demand for Store Location #10.
d dQ QQ
% AdvertisingAdvertising Elasticity of Demand
% Advertising Advertising
2. Select “appropriate” values for Q and Advertising.
dQ
For Store Location #10
15,931
Advertising $35,552
3. Calculate advertising elasticity of demand.
d
d
Advertising Elasticity of Demand
Advertising 35,5521.6154 3.6
Advertising 15,931
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Elasticities
Continuing with the demand equation derived from Data Set #1, calculate the advertising elasticity of demand for Store Location #10.
4. Interpret the elasticity.
d
d
Advertising Elasticity of Demand
Advertising 35,5521.6154 3.6
Advertising 15,931
“At current unit sales and advertising levels, every 1% increase
(decrease) in advertising increases (decreases) unit sales by 3.6%.”
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Example
Suppose that the labor cost elasticity of supply for a product is –0.1. We say that unit sales of the product are “labor cost inelastic” or “labor cost insensitive.”
This means that a given change in labor cost causes a proportionally smaller change in quantity supplied.
Inelastic vs. Elastic
Elasticity measures that are less than one (in absolute value) are called inelastic or insensitive. Elasticity measures that are greater than one (in absolute value) are called elastic or sensitive.
Suppose that the advertising elasticity of demand for a product is 5. We say that unit sales of the product are “advertising elastic” or “advertising sensitive.”
This means that a given change in advertising causes a proportionally larger change in quantity demanded.
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Price Elasticity of Demand
The price elasticity of demand indicates a product is a luxury or a necessity.
If the elasticity is greater than one in absolute value, then unit sales of this product move proportionally more than the change in price the product is a luxury.
%Price Elasticity of Demand
% PricedQ
If the elasticity is less than one in absolute value, then unit sales of this product move proportionally less than the change in price the product is a necessity.
0-
strong necessitystrong luxury weak necessityweak luxury
-1
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Price Elasticity of Demand
Using Data Set #1, find the average price price elasticity for your product across the 40 retail locations.
Demand Equation
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021t t t t tP Q MAHI CPPU AB
Price Elasticity of Demand
11
0.0013d
d d d
d
Q P P PP Q Q QP
Q
d
PQ
© Copyright 2007. Do not distribute or copy without permission. 84
Price Elasticity of Demand
Using Data Set #1, find the average price price elasticity for your product across the 40 retail locations. Store
LocationUnit Sales
Price per Unit
P / Qd (1 / -0.0013) (P / Qd)
1 10414 $65.23 0.0063 -4.822 24677 $111.16 0.0045 -3.473 13723 $64.25 0.0047 -3.604 18889 $90.05 0.0048 -3.675 22978 $100.32 0.0044 -3.366 7198 $58.16 0.0081 -6.227 15777 $82.91 0.0053 -4.048 25963 $112.89 0.0043 -3.349 19084 $93.65 0.0049 -3.7710 15931 $78.33 0.0049 -3.7811 8278 $56.66 0.0068 -5.2712 7379 $53.42 0.0072 -5.5713 22630 $104.35 0.0046 -3.5514 21377 $101.14 0.0047 -3.6415 26836 $112.05 0.0042 -3.2116 12886 $64.76 0.0050 -3.8717 25199 $111.46 0.0044 -3.4018 10660 $64.39 0.0060 -4.6519 8897 $62.15 0.0070 -5.3720 26351 $108.29 0.0041 -3.1621 8353 $61.07 0.0073 -5.6222 23814 $105.85 0.0044 -3.4223 11627 $69.58 0.0060 -4.6024 22842 $104.43 0.0046 -3.5225 12688 $55.82 0.0044 -3.3826 18522 $82.38 0.0044 -3.4227 12759 $57.25 0.0045 -3.4528 22015 $110.43 0.0050 -3.8629 10812 $59.93 0.0055 -4.2630 19522 $90.95 0.0047 -3.5831 11511 $65.71 0.0057 -4.3932 13611 $63.76 0.0047 -3.6033 4889 $47.62 0.0097 -7.4934 19688 $80.12 0.0041 -3.1335 14937 $78.66 0.0053 -4.0536 21522 $100.87 0.0047 -3.6137 12292 $61.92 0.0050 -3.8738 6706 $56.91 0.0085 -6.5339 15418 $77.18 0.0050 -3.8540 4658 $46.02 0.0099 -7.60
Average price elasticity of demand across the 40 stores = -4.23
Interpretation:
Consumers consider the product a luxury.
Consumers shopping at location #40 regard the product as a strong luxury (relative to other store locations).
Consumers shopping at location #34 regard the product as a weak luxury (relative to other store locations).
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Cross-Price Elasticity of Demand
The cross-price elasticity of demand indicates whether two products are complements, substitutes, or unrelated.
If the elasticity is positive, then unit sales of this product move in the same direction as the price of the different product the different product is a substitute for this product.
% of this productCross-Price Elasticity of Demand
% Price of a different productdQ
If the elasticity is negative, then unit sales of this product move in the opposite direction of the price of the different product the different product is a complement for this product.
+-
strong substitutesstrong complements weak substitutesweak complements
0
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Cross-Price Elasticity of Demand
Using Data Set #1, find the average cross-price price elasticity between your product and your competitor’s product.
Demand Equation
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021t t t t tP Q MAHI CPPU AB
Find /
1 11 0.0143 1 11
0.0013
d
d
d
Q CPPU
Q PPCPPU CPPUQ
Cross-Price Elasticity of Demand
11d
d d
Q CPPU CPPUCPPU Q Q
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Cross-Price Elasticity of DemandUsing Data Set #1, find the average cross-price price elasticity between your product and your competitor’s product.
Average cross-price elasticity of demand across the 40 stores = -0.003
Interpretation:
Consumers consider our product to be virtually unrelated (competition-wise) to our competitors.
If anything, consumers perceive that the products are slight complements.
Store Location
Unit SalesCompetitor Price per
UnitP competitor / Qd
our product(-11) (P competitor / Qd
our product)1 10414 $7.40 0.0007 -0.00782 24677 $6.96 0.0003 -0.00313 13723 $8.23 0.0006 -0.00664 18889 $8.31 0.0004 -0.00485 22978 $6.23 0.0003 -0.00306 7198 $6.21 0.0009 -0.00957 15777 $6.50 0.0004 -0.00458 25963 $8.82 0.0003 -0.00379 19084 $8.56 0.0004 -0.004910 15931 $7.38 0.0005 -0.005111 8278 $7.95 0.0010 -0.010612 7379 $8.51 0.0012 -0.012713 22630 $7.93 0.0004 -0.003914 21377 $7.65 0.0004 -0.003915 26836 $7.54 0.0003 -0.003116 12886 $7.97 0.0006 -0.006817 25199 $6.35 0.0003 -0.002818 10660 $8.40 0.0008 -0.008719 8897 $8.55 0.0010 -0.010620 26351 $9.12 0.0003 -0.003821 8353 $6.15 0.0007 -0.008122 23814 $8.43 0.0004 -0.003923 11627 $8.40 0.0007 -0.007924 22842 $7.96 0.0003 -0.003825 12688 $7.91 0.0006 -0.006926 18522 $8.52 0.0005 -0.005127 12759 $7.91 0.0006 -0.006828 22015 $7.47 0.0003 -0.003729 10812 $8.39 0.0008 -0.008530 19522 $8.03 0.0004 -0.004531 11511 $6.80 0.0006 -0.006532 13611 $8.66 0.0006 -0.007033 4889 $7.29 0.0015 -0.016434 19688 $7.32 0.0004 -0.004135 14937 $6.09 0.0004 -0.004536 21522 $6.27 0.0003 -0.003237 12292 $7.07 0.0006 -0.006338 6706 $7.06 0.0011 -0.011639 15418 $6.41 0.0004 -0.004640 4658 $6.55 0.0014 -0.0155
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Income Elasticity of Demand
The income elasticity of demand indicates whether a product is superior, inferior, or normal.
If the elasticity is greater than one, then unit sales of this product rise faster than income rises the product is superior.
%Income Elasticity of Demand
% IncomedQ
If the elasticity is less than one, then unit sales of this product rise slower than income rises the product is inferior.
If the elasticity equals one, then unit sales of this product rise at the same rate as the product is normal.
+-
strongly superiorstrongly inferior weakly superiorweakly inferior
1
normal
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Income Elasticity of Demand
Using Data Set #1, find the average income elasticity of demand for your product.
Demand Equation
ˆˆ 0.4878 0.0013 0.0005 0.0143 0.0021t t t t tP Q MAHI CPPU AB
dQIncome
ˆSolve Demand Equation for
ˆ ˆ375 769 0.385 11 1.615
t
t t t t t
Q
Q P MAHI CPPU AB
Income Elasticity of Demand
0.385d
d d
Q Income IncomeIncome Q Q
© Copyright 2007. Do not distribute or copy without permission. 90
Income Elasticity of Demand
Using Data Set #1, find the average income elasticity of demand for your product.
Average income elasticity of demand across the 40 stores = 2.76Interpretation:
Overall, consumers consider our product to be strongly superior.
However, at 16 of the 40 stores, consumers consider our product to be inferior.
As consumers’ incomes rise, we should shift resources away from those 16 stores toward the remaining stores.
Store Location
Unit SalesMedian Annual
Household IncomeIncome / Qd (0.385) (Income / Qd)
1 10414 $38,622 3.7087 1.42782 24677 $30,728 1.2452 0.47943 13723 $50,925 3.7109 1.42874 18889 $48,711 2.5788 0.99285 22978 $50,117 2.1811 0.83976 7198 $38,209 5.3083 2.04377 15777 $30,679 1.9445 0.74868 25963 $51,498 1.9835 0.76379 19084 $51,605 2.7041 1.0411
10 15931 $39,350 2.4700 0.951011 8278 $46,427 5.6085 2.159312 7379 $52,875 7.1656 2.758813 22630 $44,961 1.9868 0.764914 21377 $33,875 1.5846 0.610115 26836 $52,175 1.9442 0.748516 12886 $54,211 4.2070 1.619717 25199 $43,784 1.7375 0.668918 10660 $46,371 4.3500 1.674819 8897 $47,715 5.3630 2.064820 26351 $44,580 1.6918 0.651321 8353 $37,946 4.5428 1.749022 23814 $49,120 2.0627 0.794123 11627 $50,268 4.3234 1.664524 22842 $46,223 2.0236 0.779125 12688 $54,909 4.3276 1.666126 18522 $52,460 2.8323 1.090427 12759 $48,502 3.8014 1.463528 22015 $30,915 1.4043 0.540629 10812 $50,492 4.6700 1.797930 19522 $31,803 1.6291 0.627231 11511 $39,607 3.4408 1.324732 13611 $40,861 3.0021 1.155833 4889 $31,655 6.4747 2.492834 19688 $52,210 2.6519 1.021035 14937 $48,131 3.2223 1.240636 21522 $31,616 1.4690 0.565637 12292 $32,856 2.6730 1.029138 6706 $33,823 5.0437 1.941839 15418 $52,968 3.4355 1.322740 4658 $32,273 6.9285 2.6675
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Elasticities and Sales
Sales (“total revenue”) is calculated as:
Total Revenue = (Price per unit) (Unit sales)
By extension, %Δ Total Revenue = %Δ Price per unit + %Δ Unit sales
Example
Suppose that the price of a product rises by 12% and the unit sales drop by 8%.
Sales (total revenue) of the product change by 12% – 8% = 4%.
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Applying Elasticities
US Air’s market researchers estimate that, were US Air to decrease the price of its coach fairs by 10%, then the number of coach tickets sold would increase by 20%.
To increase US Air’s sales, should US Air increase or decrease its coach fairs?
% 0.2
Price Elasticity of Demand 2% Price 0.1
dQ
A 1% increase in price will be accompanied by a 2% decrease in Qd. Similarly, a 1% decrease in price will be accompanied by a 2% increase in Qd.
A 1% increase in price will result in a 1% – 2% = –1% change in sales.
A 1% decrease in price will result in a –1% + 2% = +1% change in sales.
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Applying Elasticities
The May Company owns Filenes and Hechts. May is going to open two new stores (one Filenes and one Hechts) in New York and Philadelphia. The populations in each area (adjusted for the difficulty of getting to the stores) are comparable, and unit sales are initially equivalent in the two markets. Research shows that the income elasticity for major selling items at Filenes is approximately 1.1 while the income elasticity for major selling items at Hechts is approximately 0.9. Demographers predict that the average income level in New York will rise by 30% over the next twenty years (the expected life of the store) while the average income level in Philadelphia will rise by 20% over the same period. Assume that price at Filenes and Hechts are roughly equivalent and that unit sales at the two stores are also roughtly equivalent. Based on this information, given that May is going to open one of each store, which should it locate in New York and which in Philadelphia?
%Income Elasticity of Demand for Filenes 1.1
% Income%
Income Elasticity of Demand for Hechts 0.9% Income
d
d
Q
Q
New York
Philadelphia
% Income 0.3
% Income 0.2
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Applying Elasticities
New York
Philadelphia
Hechts
%% % Income 0.9 0.3 0.27
% Income
%% % Income 0.9 0.2 0.18
% Income
dd
dd
New York
Philadelphia
Filenes
%% % Income 1.1 0.3 0.33
% Income
%% % Income 1.1 0.2 0.22
% Income
dd
dd
© Copyright 2007. Do not distribute or copy without permission. 95
Applying Elasticities
The May Company owns Filenes and Hechts. May is going to open two new stores (one Filenes and one Hechts) in New York and Philadelphia. The populations in each area (adjusted for the difficulty of getting to the stores) are comparable, and unit sales are initially equivalent in the two markets. Research shows that the income elasticity for major selling items at Filenes is approximately 1.1 while the income elasticity for major selling items at Hechts is approximately 0.9. Demographers predict that the average income level in New York will rise by 30% over the next twenty years (the expected life of the store) while the average income level in Philadelphia will rise by 20% over the same period. Assume that price at Filenes and Hechts are roughly equivalent and that unit sales at the two stores are also roughtly equivalent. Based on this information, given that May is going to open one of each store, which should it locate in New York and which in Philadelphia?New York PhiladelphiaFilenes 0.33 0.22Hechts 0.27 0.18
27% + 22% = 49% change in unit sales
33% + 18% = 51% change in unit sales
Mays should locate the Filenes store in New York and the Hechts store in Philadelphia.
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Applying Elasticities
Bayer markets a prescription migraine drug and a heart medication. Because of interactions, patients cannot take both the migraine drug and the heart medication. Market research indicates that the price elasticity for the migraine drug is –0.7, the price elasticity for the heart medication is –0.5, and the cross-elasticity for the heart medication and the migraine drug is 0.1. The unit contributions for the migraine and heart drugs are, respectively, $0.75 and $0.52. Bayer sells 10 million units of each quarterly. Should Bayer alter the price of either product, and if so in what direction(s)?
% MigrainePrice Elasticity of Demand for Migraine 0.7
% Price
% HeartPrice Elasticity of Demand for Heart 0.5
% Price
% Heart % MigraineCross-price Elasticity of Demand
% Price Migraine % P
d
d
d d
Q
Q
Q Q0.1
rice Heart
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Applying Elasticities
Migraine Migraine Migraine
Heart Heart Heart
% Sales % %
% Sales % %
P Q
P Q
Suppose Bayer increases the price of the migraine drug by 15%
Migraine
Heart
% Sales 0.15 0.105 0.045 4.5%
% Sales 0 0.015 0.015 1.5%
Migraine
Heart
Total
Contribution 4.5% 10 million $0.75 $337,500
Contribution 1.5% 10 million $0.52 $78,000
Contribution $337,500 $78,000 $415,500
MigraineMigraine Migraine
Migraine
HeartHeart Migraine
Migraine
%% % 0.7 0.15 0.105
%
%% % 0.1 0.15 0.015
%
QQ P
P
QQ P
P
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Applying Elasticities
Suppose Bayer increases the price of the heart medication by 15%
Migraine
Heart
% Sales 0 0.015 0.015 1.5%
% Sales 0.15 0.075 0.075 7.5%
Migraine
Heart
Total
Contribution 1.5% 10 million $0.75 $112,500
Contribution 7.5% 10 million $0.52 $39,000
Contribution $112,500 $39,000 $151,500
Migraine Migraine Migraine
Heart Heart Heart
% Sales % %
% Sales % %
P Q
P Q
MigraineMigraine Heart
Heart
HeartHeart Heart
Heart
%% % 0.1 0.15 0.015
%
%% % 0.5 0.15 0.075
%
QQ P
P
QQ P
P
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Applying Elasticities
Compare the 15% increase in the price of the migraine drug to the 15% increase in the price of the heart drug.
Migraine
Heart
Total
Increase Price of Heart Drug by 15%
Contribution 1.5% 10 million $0.75 $112,500
Contribution 7.5% 10 million $0.52 $39,000
Contribution $112,500 $39,000 $151,500
Migraine
Heart
Total
Increase Price of Migraine Drug by 15%
Contribution 4.5% 10 million $0.75 $337,500
Contribution 1.5% 10 million $0.52 $78,000
Contribution $337,500 $78,000 $415,500
Firm obtains greater profit from increasing the price of the migraine drug.
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Analysis of the Firm
The firm’s goal is to maximize shareholder value. Specifically, the firm seeks to maximize the present discounted value of future cash flows. In economics, we call this “profit maximization.”
Business Terminology Economics Terminology
Sales Total Revenue
COGS, SG&A, R&D Variable Costs
D&A Fixed Costs
Contribution Producer Surplus
Net Income Accounting Profit
“Normal Profit” Zero Economic Profit
“Excess Profit” Economic Profit
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Analysis of the Firm
Long-run vs. Short-run Costs
Long-run (or “fixed”) costs are costs that remain even if the firm produces no output. These costs include things like rent on office space, depreciation on buildings and equipment, and casualty insurance.
Fixed costs can be eliminated, but only by selling off the firm’s assets and discharging its debt. Because this cannot be done quickly, we call these fixed costs “long-run” costs.
Short-run (or “variable”) costs are costs that are change as the firm’s level of output changes. These costs include things like materials used in production, electricity, fuel, and labor.
Variable costs can be eliminated virtually immediately by ceasing operations.
Note that both variable and fixed costs include both explicit and opportunity costs.
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Analysis of the Firm
Average and Marginal Cost Measures
Total Cost Variable Cost Fixed Cost
Total CostAverage Total Cost
Units Output
Variable CostAverage Variable Cost
Units Output
Fixed CostAverage Fixed Cost
Units Output
Total CostMarginal Cost
Units Output
Average cost measures are useful for analyzing costs that the firm has incurred up to the present.
Marginal cost measures are useful analyzing costs that the firm will incur in the future.
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Analysis of the Firm
Economies and diseconomies of scale arise from the non-linear relationship between inputs and output.
Production Stage IAs inputs rise, output rises proportionally more. Example: Double inputs and output more than doubles.
Cause: Adding inputs presents opportunities for specialization.
Production Stage IIAs inputs rise, output rises proportionally less. Example: Double inputs and output less than doubles.
Cause: Adding inputs creates physical and/or managerial congestion.
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Analysis of the Firm
Stages of production give rise to economies and diseconomies of scale
Economies of scale: Average cost as decreases as output increases.
Diseconomies of scale: Average cost increases as output increases.
Units Output Total Cost Average Total Cost
10,000 $1.0 million $1.0 million / 10,000 = $100
15,000 $1.4 million $1.4 million / 15,000 = $93
20,000 $1.9 million $1.9 million / 20,000 = $95
Economiesof scaleDiseconomiesof scale
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Analysis of the Firm
$
Units output
ATC
AVC
MC
AFC
Specialization
Congestion
Increasing Returns to Variable Factors
Economies of Scale Diseconomies of Scale
Decreasing Returns to Variable Factors
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Analysis of the Firm
$
Units output
ATC
AVC
MC
AFC
Specialization Over this range, the firm continues to experience economies of scale despite the fact that congestion has set in the congestion is not yet severe enough to have overcome the cumulative positive effect of specialization
Economies of Scale
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Analysis of the Firm
Your firm can produce 10,000 units of product at a total cost of $1 million, or 11,000 units of product at a total cost of $1.2 million. Your firm can sell, at a fixed price of $120 per unit, as much product as it can produce.
Should your firm produce 10,000 units or 11,000 units?
Average cost analysis
Average cost @ 10,000 units = $1 million / 10,000= $100 per unitAverage cost @ 11,000 units = $1.2 million / 11,000 = $109 per unit
At a price of $120 per unit, price exceeds per-unit cost. Produce the extra 1,000 units.
Marginal cost analysis
Marginal cost of additional 1,000 units = Δ Total Cost / Δ Units Output= ($1.2 m. – $1 m.) / (11,000 – 10,000)= $200 per unit
At a price of $120 per unit, price is less than marginal cost. Do not produce the extra 1,000 units.
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Analysis of the Firm
Output rule for profit maximization
Produce the output level at which MR = MC.
Suppose MR > MC
If the firm increases its output level, what it gains in sales (MR) exceeds what it loses in increased costs (MC).
As the firm increases its output level, MC rises thereby resulting in MR = MC.
Suppose MR < MC
If the firm decreases its output level, what it loses in sales (MR) is less than what it saves in decreased costs (MC).
As the firm decreases its output level, MC falls thereby resulting in MR = MC.
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Analysis of the Firm
Consider a simple case wherein the firm can sell as many units as it wants at a fixed price.
Example
The market price is $100 per unit.
If the firm sells 50 units, its TR = ($100)(50) = $5,000
If the firm sells 51 units, its TR = ($100)(51) = $5,100
MR = ΔTR / ΔQ = ($5,100 – $5,000) / (51 – 50) = $100
When MR = Price, we say that the firm is a price taker.
When would MR not be the same as price?
If, in altering the quantity of output produced, the firm caused a change in the market price. We say that the firm is a price setter.
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Analysis of the Firm
$
Units output
ATCAVC
MC
AFC
P = $10
A Price Taking Firm Firm’s output level has no impact on market price MR = Price
Q = 150
When P=$10, MR = MC at an output of 150 units firm will produce 150 units
P = $15
Q = 200
When P=$15, MR = MC at an output of 200 units firm will produce 200 units
© Copyright 2007. Do not distribute or copy without permission. 111
Analysis of the Firm
$
Units output
ATCAVC
MC
AFC
Shutdown price
Breakeven price
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Analysis of the Firm
Three Pricing Scenarios
Price is above breakeven price: Price > ATC
Firm is making an economic profit
Price is below breakeven price but above shutdown price: ATC > Price > AVC
Firm is incurring a loss and should continue producing in the short run. In the long run, the firm must either shutdown or reorganize.
Price is below shutdown price: AVC > Price
Firm is incurring a loss and should shutdown in the short run.
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Analysis of the Firm
Example
A firm’s profit maximizing output level is 1,000 units per day. The firm’s fixed costs are $50,000 per day. At 1,000 units per day, the firm’s variable costs are $80,000 per day.
What are the firm’s AVC and ATC?
$80,000 per dayAVC $80 per unit
1,000 units per day
$50,000 per dayAFC $50 per unit
1,000 units per day
ATC AVC AFC $80 per unit $50 per unit $130 per unit
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Analysis of the Firm
Example
A firm’s profit maximizing output level is 1,000 units per day. The firm’s fixed costs are $50,000 per day. At 1,000 units per day, the firm’s variable costs are $80,000 per day.
The market price of the firm’s product is $100 per unit. How much profit would the firm make (a) if it continued to produce and (b) if it shutdown?
Continue to produce
VC $80 per unit per day 1,000 units per day $80,000 per day
FC $50,000 per day
TC VC FC $80,000 per day $50,000 per day $130,000 per day
TR Price per unit Units per day $100 1,000 $100,00
0 per day
Profit TR TC $100,000 per day $130,000 per day $30,000 per day
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Analysis of the Firm
Example
A firm’s profit maximizing output level is 1,000 units per day. The firm’s fixed costs are $50,000 per day. At 1,000 units per day, the firm’s variable costs are $80,000 per day.
The market price of the firm’s product is $100 per unit. How much profit would the firm make (a) if it continued to produce and (b) if it shutdown?
Shutdown
VC $80 per unit per day 0 units per day $0 per day
FC $50,000 per day
TC VC FC $0 per day $50,000 per day $50,000 per day
TR Price per unit Units per day $100 0 $0 per day
Profit TR TC $0 per day $50
,000 per day $50,000 per day
Firm is better off producing at a loss than shutting down.
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Quantitative Analysis of a Firm
We have already seen how to estimate a demand function.
If the unit sales data we use to estimate demand are unit sales for a single firm, then the demand function we obtain is the firm demand function.
If the unit sales data we use to estimate demand are unit sales for the industry, then the demand function we obtain is the industry demand function.
To estimate the firm’s total cost function, we employ data on the firm’s unit sales, the firm’s accounting costs, and the firm’s opportunity costs.
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Data Set #2 contains monthly unit sales and cost figures for a firm.
1. For each month, calculate the firm’s total accounting cost, opportunity cost, total (economic) cost, and ATC.
Total accounting cost COGS SG&A D&A
0.08Opportunity cost Total accounting cost
12
Total (economic) cost Total accounting cost Opportunity cost
Total cost
ATCUnits output
Quantitative Analysis of a Firm
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Data Set #2 contains monthly unit sales and cost figures for a firm.
2. Using the unit sales data, the total (economic) cost data, and knowledge of the expected shape of the total cost function, estimate the ATC function.
We expect ATC to be parabolic ATC should be a function of both Q and Q 2. Because AFC = FC / Q, we also expect ATC to be a function of 1/Q.
Use OLS to estimate the ATC function.
Quantitative Analysis of a Firm
21 2 3
1ATC Q Q u
Q
ATC Q Q^2 1 / Q$0.2710 169,344 28,677,390,336 5.90514E-06$0.2742 242,431 58,772,789,761 4.12489E-06$0.3152 110,871 12,292,378,641 9.01949E-06$0.2593 211,975 44,933,400,625 4.71754E-06$0.3514 91,596 8,389,827,216 1.09175E-05$0.2668 171,039 29,254,339,521 5.84662E-06$0.3268 246,864 60,941,834,496 4.05081E-06$0.2867 247,696 61,353,308,416 4.03721E-06$0.2662 171,600 29,446,560,000 5.82751E-06$0.2988 128,896 16,614,178,816 7.75819E-06$0.2622 224,079 50,211,398,241 4.46271E-06$0.3040 249,964 62,482,001,296 4.00058E-06$0.2657 180,304 32,509,532,416 5.54619E-06
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2. Using the unit sales data, the total (economic) cost data, and knowledge of the expected shape of the total cost function, estimate the ATC function.
Quantitative Analysis of a Firm
ATC = 0.9709 – (0.000006) Q + (0.00000000001) Q2 – 17505 / Q
SUMMARY OUTPUT
Regression StatisticsMultiple R 0.889690194R Square 0.791548642Adjusted R Square 0.777651885Standard Error 0.013371982Observations 49
ANOVAdf SS MS F Significance F
Regression 3 0.030554626 0.010184875 56.95923371 2.31706E-15Residual 45 0.008046446 0.00017881Total 48 0.038601072
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept 0.970926175 0.300855057 3.227222387 0.002333554 0.364972994 1.576879356X Variable 1 -6.00076E-06 1.86697E-06 -3.214177278 0.002421263 -9.76103E-06 -2.2405E-06X Variable 2 1.43492E-11 3.66995E-12 3.909921027 0.000308356 6.95755E-12 2.17409E-11X Variable 3 -17505.55997 15232.04504 -1.149258679 0.256521162 -48184.47307 13173.35312
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3. Find the firm’s efficient output level.
Quantitative Analysis of a Firm
Minimize the ATC function with respect to Q.
ATC is minimum when Q = 192,665.
4. Find the firm’s breakeven price.
Breakeven price is the minimum attainable ATC.
ATC = 0.9709 – (0.000006) Q + (0.00000000001) Q2 – 17505 / Q
ATC = 0.9709 – (0.000006)(192,665)+ (0.00000000001)(192,665)
– 17505 / 192,665
= $0.26
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5. Looking at the data, at what output level was the firm’s ATC minimum?
Quantitative Analysis of a Firm
ATC was minimum ($0.2593) at 211,975 output.
6. Explain why this figure differs from the figure we calculated in step #3.
Step #3 gave us the best estimate of the efficient output level. Step #5 gave the output level that, possibly by random chance, produced the historically lowest ATC.
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SUMMARY OUTPUT
Regression StatisticsMultiple R 0.917876354R Square 0.842497001Adjusted R Square 0.835649045Standard Error 0.014106472Observations 49
ANOVAdf SS MS F Significance F
Regression 2 0.048963697 0.024481849 123.0289656 3.4486E-19Residual 46 0.009153658 0.000198993Total 48 0.058117355
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%Intercept 0.222387617 0.02876938 7.73001074 7.41553E-10 0.164477859 0.280297375X Variable 1 -1.41482E-06 3.53371E-07 -4.003778415 0.000225205 -2.12612E-06 -7.03521E-07X Variable 2 5.5078E-12 9.90754E-13 5.559200359 1.31852E-06 3.51352E-12 7.50209E-12
Using Data Set #2, find the firm’s shutdown price.
Quantitative Analysis of a Firm
The shutdown price is the minimum attainable AVC.
AVC = α + β1 Q + β2 Q 2
ATC Q Q^2$0.1476 169,344 28,677,390,336$0.1904 242,431 58,772,789,761$0.1345 110,871 12,292,378,641$0.1639 211,975 44,933,400,625$0.1314 91,596 8,389,827,216$0.1480 171,039 29,254,339,521$0.2452 246,864 60,941,834,496$0.2025 247,696 61,353,308,416$0.1482 171,600 29,446,560,000$0.1379 128,896 16,614,178,816$0.1713 224,079 50,211,398,241$0.2224 249,964 62,482,001,296$0.1509 180,304 32,509,532,416
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Using Data Set #2, find the firm’s shutdown price.
Quantitative Analysis of a Firm
Minimum AVC is $0.13 (at Q = 128,438) this is the shutdown price.
AVC = 0.2239 – (0.0000014) Q + (0.00000000006) Q2
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Industry Structures
Industry structure refers to the market power that individual firms in an industry have.
MonopolyOligopolyMonopolistic Competition
Perfect/PureCompetition
Individual firms have greater influence over the market price
Individual firms have less influence over the market
price
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Industry StructuresPerfect/Pure Competition1. Many firms2. Individual firm’s output is small relative to the market3. Firms produce a homogeneous product4. Free entry/exit to/from the industry5. All market participants have full information (perfect competition)
Monopolistic Competition1. Many firms2. Individual firm’s output is small relative to the market3. Firms produce a heterogeneous product4. Free entry/exit to/from the industry
Oligopoly1. Few, but more than one, firms2. Individual firm’s output is large relative to the market3. May or may not be free entry/exit to/from the industry
Monopoly1. (Usually) one firm2. Individual firm’s output is virtually the entirety of the market3. May or may not be free entry/exit to/from the industry
© Copyright 2007. Do not distribute or copy without permission. 126
Perfect/Pure Competition
$
Q
S
D
Equilibrium price is determined by the market
$
Q
ATC
AVC
MC
AFC
Cost curves depict a single firm in the industry
All firms in the industry charge the market price (firms are “price takers”) MR = Price
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4. Area is economic loss
Perfect/Pure Competition
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
2. Profit max output is here
1. Equilibrium price is here
MR
3. Firm’s ATC is here
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Firm is incurring an economic loss
The accounting profit the firm is making is less than the accounting profit earned by firms in other industries that are exposed to comparable risk.
Perfect/Pure Competition
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
MR The economic loss provides incentive (1) for firms to exit to similar industries (e.g. due to low margins in the PC market, Hewlett-Packard will likely sell off its PC division and focus on its printer division), and (2) for firms to shut down entirely (e.g. due to on-going losses, Eastern Airlines shut down in 1991).
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Perfect/Pure Competition
$
Q
D
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
SS’1. Departure of firms from the
industry is a negative producer shock Supply decreases
2. Decrease in supply causes market price to rise
4. When economic profit reaches zero, there is no longer incentive for firms to leave the industry and so price stabilizes.
3. As market price rises, profit maximiz-ing output level and economic profit increase
© Copyright 2007. Do not distribute or copy without permission. 130
Perfect/Pure Competition
$
Q
S
D
$
Q
ATC
AVC
MC
AFC
Equilibrium price is determined by the market
All firms in the industry charge the market price (firms are “price takers”) MR = Price
MR
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4. Area is economic profit
Perfect/Pure Competition
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
2. Profit max output is here
1. Equilibrium price is here
MR
3. Firm’s ATC is here
© Copyright 2007. Do not distribute or copy without permission. 132
Firm is incurring an economic profit
The accounting profit the firm is making is more than the accounting profit earned by firms in other industries that are exposed to comparable risk.
Perfect/Pure Competition
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
MR
The economic profit provides incentive (1) for firms in similar industries to enter this industry (e.g. in the 1980’s Hewlett-Packard, which made mainframe computers, entered the PC industry), and (2) for entrepreneurs to create new firms in this industry (e.g. in the 1990’s Dell computer was launched as a PC manufacturer/retailer).
© Copyright 2007. Do not distribute or copy without permission. 133
Perfect/Pure Competition
$
Q
$
Q
ATC
AVC
MC
AFC
A Single Firm in the Industry
S’
1. Entrance of firms to the industry is a positive producer shock Supply increases
4. When economic profit reaches zero, there is no longer incentive for firms to enter the industry and so price stabilizes.
S
D
3. As market price falls, profit maximiz-ing output level and economic profit decrease
2. Increase in supply causes market price to rise
© Copyright 2007. Do not distribute or copy without permission. 134
Perfect/Pure Competition
$
Q
ATC
AVC
MC
AFC
Efficient output is the output level at which ATC is minimum.
A firm that produces at the minimum attainable ATC is called “efficient.”
Efficient firms utilize the minimum possible resources to produce their product.
From an economy-wide perspective, efficient firms are good because they waste little or no resources.
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Perfect/Pure Competition
Conclusions
1. In the short-run, firms in perfect/pure competition may make an economic profit or incur an economic loss.
2. In the long-run, firms in perfect/pure competition will make zero economic profit.
3. Firms in perfect/pure competition are efficient in the long-run.
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Monopoly
In a monopoly industry there is (usually) one firm. The firm represents (virtually) the entirety of market supply.
There are instances in which an industry may contain a single very large firm and some (perhaps many) very small firms (e.g. long distance service prior to AT&T’s breakup). In such an industry, the large firm behaves as if it were the only firm and the small firms behave as if they were in perfect competition.
© Copyright 2007. Do not distribute or copy without permission. 137
MonopolyA firm that can influence the market price does so by altering output. When the firm increases output, a surplus results and the market price falls. When the firm decreases output, a shortage results and the market price rises.
When a firm can alter the market price by altering output, MR is no longer equal to price.Example
• A large firm produce 100 units per day.• The resulting market price is $10 per unit.• TR = ($10 per unit)(100 units per day) = $1,000 per day
If the firm increases its output to 110 units per day, a surplus results. The market price falls to $9.95 per unit.
TR = ($9.95 per unit)(110 units per day) = $1,094.50 per day
MR = ΔTR/ΔQ = ($1,094.50 – $1,000) / (110 – 100) = $9.45.
MR is less than price because the increase in output lowers the price for all units.
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Monopoly
$
Q
A Monopoly Firm
D
MR
When the firm produces 100 units…
…the resulting price is $10…
…but the MR is $9.45.
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4. Economic profit is profit-per-unit multiplied by units sold.
Monopoly
$
Q
ATC
MC
A Monopoly Firm
D
MR
1. Firm produces where MR = MC
2. Resulting price is determined by D
3. Cost per unit is determined by ATC
© Copyright 2007. Do not distribute or copy without permission. 140
Monopoly
$
Q
ATC
MC
A Monopoly Firm
D
MR
Profit maximizing output level
Efficient output level
Notice that the firm’s efficient output level is different from its profit maximizing output level.
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Monopoly
$
Q
ATC
MC
Produce at Profit Max Output
D
MR
If the firm were to produce at the efficient output level, gains in cost savings due to lower per-unit costs would be more than offset by losses in revenue due to decreased price.
$
ATC
MC
Produce at Efficient Output
D
MR
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Monopoly
Suppose a monopoly firm faces the following demand and average total cost functions
2
6,354 4.5
100ATC 3,021 4.9 0.002
P Q
Q QQ
1. Find the firm’s profit maximizing output level. Hint: Use Excel’s SOLVER to maximize profit with respect to output.
Q = 815 maximizes profit
Q
2 100ATC 3,021 4.9 0.002Q Q
Q6,354 4.5P Q
TC ATC Q TR P Q
Profit TR TC
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Suppose a monopoly firm faces the following demand and average total cost functions
2. Find the market price that results when the firm produces at its profit maximizing output level
P = 6,354 – (4.5)(815) – 100/Q = $2,686.68
3. Find the firm’s ATC when it produces at the profit maximizing output level.ATC = 3,021 – 4.9Q + 0.002Q 2 – 100/Q = $356.14
4. Find the firm’s economic profit when it produces at the profit maximizing output level.
Profit = TR – TC = (P)(Q) – (ATC)(Q) = ($2,686.68)(815) – ($356.14)(815)
= $1.9 million
Monopoly
2
6,354 4.5
100ATC 3,021 4.9 0.002
P Q
Q QQ
© Copyright 2007. Do not distribute or copy without permission. 144
Suppose a monopoly firm faces the following demand and average total cost functions
5. Find the efficient output level. Hint: Use SOLVER to minimize ATC with respect to output.
Q = 1,225
6. Find the firm’s ATC when it produces at the efficient output level.
ATC = 3,021 – 4.9Q + 0.002Q 2 – 100/Q = $19.83
7. Find the market price that would result if the firm produced at the efficient output level.
P = 6,354 – (4.5)(1,225) = $841.43
Monopoly
2
6,354 4.5
100ATC 3,021 4.9 0.002
P Q
Q QQ
© Copyright 2007. Do not distribute or copy without permission. 145
Suppose a monopoly firm faces the following demand and average total cost functions
8. Find the firm’s economic profit when it produces at the efficient output level.Profit = TR – TC = (P)(Q) – (ATC)(Q) = ($841.43)(1,225) – ($19.83)(1,225)
= $1.0 million
Monopoly
2
6,354 4.5
100ATC 3,021 4.9 0.002
P Q
Q QQ
© Copyright 2007. Do not distribute or copy without permission. 146
Monopoly
$
Q
ATC
MC
D
MR
815
$356.14
$2,686.68
1,225
$1.9 million
$19.83
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Monopoly
Conclusions
1. The monopoly firm makes an economic profit.
2. The monopoly firm is inefficient.
© Copyright 2007. Do not distribute or copy without permission. 148
Oligopoly
In an oligopoly industry, there are several firms. Each of the firms is large enough (relative to the market) to cause an impact on the market price via altering output.
An oligopoly exists in one of three states
1. Competitive oligopoly Firms do not coordinate their production levels.
2. Cartel oligopoly Firms coordinate their production levels effectively acting as a single firm.
3. Chiseling oligopoly One or more firms renege on a cartel agreement while other firms adhere to the cartel agreement.
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Oligopoly
Suppose an oligopoly industry is comprised of two firms (a two-firm oligopoly is sometimes called a duopoly). The firms face the following demand and average total cost functions:
Notice that the two firms face the same market price, P, and that the market price is determined by the combined output of the two firms.
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
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Oligopoly
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
1. Assume that the industry is a competitive oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Follow an iterative procedure in which you set the output level for one firm, then find the profit maximizing output for the other firm.
Example: Set both the output of each firm to 400 units.
Q P ATC TR TC ProfitFirm #1 400 $2,754 $1,381 $1,101,600 $552,400 $549,200Firm #2 400 $2,754 $1,381 $1,101,600 $552,400 $549,200
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Oligopoly
1. Assume that the industry is a competitive oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Example: Given that Firm #2 is producing 400 units, adjust Firm #1’s output so as to maximize the profit for Firm #1.
Q P ATC TR TC ProfitFirm #1 577 $1,960 $861 $1,129,787 $496,274 $633,513Firm #2 400 $1,960 $1,381 $783,875 $552,400 $231,475
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
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Oligopoly
1. Assume that the industry is a competitive oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Example: Now, given Firm #1’s profit maximizing output, adjust Firm #2’s output so as to maximize the profit for Firm #2.
Q P ATC TR TC ProfitFirm #1 577 $1,852 $861 $1,067,989 $496,274 $571,715Firm #2 424 $1,852 $1,304 $785,125 $552,462 $232,663
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
© Copyright 2007. Do not distribute or copy without permission. 153
Oligopoly
1. Assume that the industry is a competitive oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Example: Given Firm #2’s profit maximizing, adjust Firm #1’s output so as to maximize the Firm #1’s profit.
Q P ATC TR TC ProfitFirm #1 559 $1,933 $908 $1,079,786 $507,121 $572,666Firm #2 424 $1,933 $1,304 $819,134 $552,462 $266,673
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
© Copyright 2007. Do not distribute or copy without permission. 154
Oligopoly
1. Assume that the industry is a competitive oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Continue iteratively until the two profit maximizing output levels converge.
Q P ATC TR TC ProfitFirm #1 498 $1,870 $1,076 $931,613 $536,159 $395,454Firm #2 498 $1,870 $1,076 $931,613 $536,159 $395,454
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
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Oligopoly
2. Assume that the industry is a cartel oligopoly. Find the profit maximizing output levels, ATC, and profits for the two firms.
Maximize the combined profits of the two firms with respect to the two firm’s output levels.
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
Q P ATC TR TC ProfitFirm #1 328 $3,404 $1,630 $1,115,778 $534,223 $581,555Firm #2 328 $3,404 $1,630 $1,115,778 $534,223 $581,555
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Oligopoly
3. Assume that Firm #1 adheres to the cartel profit maximizing output level, but that Firm #2 chisels. Find the profit maximizing output levels, ATC, and profits for the two firms.
Set Firm #1’s output at the cartel profit max level and maximize Firm #2’s profit with respect to Firm #2’s output.
1 2
21 1 1
22 2 2
6,354 4.5
ATC 3,021 4.9 0.002
ATC 3,021 4.9 0.002
P Q Q
Q Q
Q Q
Q P ATC TR TC ProfitFirm #1 328 $2,057 $1,630 $674,298 $534,223 $140,075Firm #2 627 $2,057 $735 $1,289,846 $460,750 $829,096
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Oligopoly
Compare the results from the three cartel scenarios
Q P ATC TR TC ProfitFirm #1 328 $2,057 $1,630 $674,298 $534,223 $140,075Firm #2 627 $2,057 $735 $1,289,846 $460,750 $829,096
Q P ATC TR TC ProfitFirm #1 328 $3,404 $1,630 $1,115,778 $534,223 $581,555Firm #2 328 $3,404 $1,630 $1,115,778 $534,223 $581,555
Q P ATC TR TC ProfitFirm #1 498 $1,870 $1,076 $931,613 $536,159 $395,454Firm #2 498 $1,870 $1,076 $931,613 $536,159 $395,454
Competitive Oligopoly
Cartel Oligopoly
Chiseling Oligopoly
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Oligopoly
Cartel Instability and the Cyclicality of Oligopoly Structure
1. Starting from a competitive oligopoly, firms have incentive to form a cartel thereby increasing their profits at the expense of consumers.
2. Once a cartel is formed, individual firms have incentive to chisel on the cartel agreement thus garnering even more profit, though at the expense of the other oligopolists and to the benefit of consumers.
3. Firms remaining in the cartel now have even more incentive to chisel. As the cartel agreement falls apart, firms are now acting independently return to competitive oligopoly.
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Oligopoly
Conclusions
1. In a competitive oligopoly, firms make an economic profit and are inefficient.
2. In a cartel oligopoly, firms make greater economic profit and are more inefficient than in a competitive oligopoly.
3. In a chiseling oligopoly, the chiseling firms make greater economic profit and are less inefficient than in a cartel oligopoly, while the non-chiseling firms make less economic profit and are as inefficient as in a cartel oligopoly.
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Monopolistic Competition
In a monopolistically competitive industry, there are many firms. Individual firms are too small to impact the market price for the brand category, but, via product differentiation, can influence the market prices of their individual brands.
To the extent that the consumer focuses on the brand category, the individual firm acts like a firm in perfect competition. To the extent that the consumer focuses on the individual brand, the individual firm acts like a monopoly (i.e. the individual firm is the only producer of a given brand).
Whereas oligopoly and monopoly firms rely more on their abilities to impact market price via changes in their output levels, monopolistically competitive firms rely more on their abilities to impact the prices of their individual brands via shifts in the firm demand curves due to product differentiation and marketing.
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Monopolistic Competition
Monopolistic Competition and the Consumer Information Problem
Consumer information problem Consumers must acquire enough information to make an informed purchase decision, but information gathering is costly (both explicitly and cognitively).
Monopoly Industry Lack of competing brands makes information gathering negligible.
Oligopoly Industry Few competing brands makes information gathering low cost.
Perfect Competition Intense competition causes competing brands to be identical making information gathering negligible.
Monopolistic Competition Many different brands makes information gathering very costly.
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Monopolistic Competition
External Uncertainty Partial Information Measurement Error Obsolete Information
True Brand Universe
Estimated Brand Universes
Estimated Utilities
Perceived Product-Market Characteristics Cluster Sizes Cluster Variances Cluster Frontiers Brand Variances Granularity
Internal Uncertainty Absolute Error Utility Relative Error Utility
Consideration
Brand information mitigates external uncertainty
Consumption experience mitigates internal uncertainty
Choice-Given-Consideration
True Utilities
The iterative choice process and consumer information
Perceived Brand Universe Characteristics
© Copyright 2007. Do not distribute or copy without permission. 163
MGD
Samuel Adams
Budweiser
Coors
Heineken
Guinness
Genesee
Fosters
Aff
ord
abili
ty
Monopolistic Competition
Taste
Affordability cluster
Taste cluster
Cluster frontier combines the best attributes of the observed brands within the cluster
A Consumer’s Perceived Brand Universe
© Copyright 2007. Do not distribute or copy without permission. 164
MGD
Samuel Adams
Budweiser
Coors
Heineken
Guinness
Genesee
Fosters
Aff
ord
abili
ty
Monopolistic Competition
Taste
Characteristics of the Perceived Brand Universe
Cluster size: How many brands are in a cluster
Cluster variance: How “spread out” are brands within a cluster
Cluster frontier: How far away are brands from the frontier
Brand variance: How uncertain is the consumer about a brand’s true attributes
Granularity: How distinct are the clusters from each other
© Copyright 2007. Do not distribute or copy without permission. 165
Monopolistic Competition
Compensatory vs. Non-Compensatory Decision-Making
Compensatory Decision-Making: Levels of one attribute are traded-off for levels of another attribute. Example: A car buyer chooses a less powerful engine in exchange for greater fuel efficiency.
Non-Compensatory Decision-Making: Levels of an attribute must surpass some minimal boundary independent of other attribute levels. Example: A home buyer requires a minimum of three bedrooms regardless of location, number of bathrooms, garage, etc.
Pros and Cons:
Compensatory decision-making• Cognitively costly• Unlikely to erroneously reject brands
Non-compensatory decision-making• Cognitively inexpensive• Likely to erroneously reject brands
© Copyright 2007. Do not distribute or copy without permission. 166
MGD
Samuel Adams
Budweiser
Coors
Heineken
Guinness
Genesee
Fosters
Aff
ord
abili
ty
Monopolistic Competition
Taste
A Consumer’s Perceived Brand Universe
Consideration Phase: Consumer selects a single cluster of brands via non-compensatory decision-makingChoice Phase: Consumer selects a single brand from within the consideration cluster via compensatory decision-making
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Monopolistic Competition
Behavioral Propositions
1. An increase in cluster size increases the consumer’s probability of consideration for the cluster.
2. An increase in cluster variance decreases the consumer’s probability of consideration for the cluster.
3. An increase in the distance of a brand to its cluster frontier decreases the probability of choice-given-consideration for the brand.
4. An increase in brand variance decreases the effect of a brand’s distance-to-frontier on the probability of choice-given-consideration.
5. An increase in granularity increases the effect of cluster size on the probability of consideration, and decreases the effect of cluster variance on the probability of consideration.
Pr Choice Pr Consideration Pr Choice | Consideration
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MGD
Red Dog
Miller introduces a new brand, Red Dog. Miller positions Red Dog to be close, but strictly inferior to its flagship brand MGD.
Samuel Adams
Budweiser
Coors
Heineken
Guinness
Genesee
Fosters
Aff
ord
abili
ty
Monopolistic Competition
Taste
Case Study: Miller’s Red Dog Brand
Red Dog’s introduction did not move the cluster frontier no impact on Pr(Choice|Consideration)
Red Dog’s introduction increased the size of the cluster.
Because Red Dog was positioned close to MGD, there was minimal impact on the cluster variance.
Net result: Red Dog’s introduction increased Pr(Consideration) for the clusterConclusion: Pr(Choice) for MGD (and, in fact, all brands within the cluster) increased
MGD gained market share at the expense of “imports.”
© Copyright 2007. Do not distribute or copy without permission. 169
Ben & Jerry
Breyers
Haagen-Dazs
Carnival
Weight Watchers
EdysC
alo
ries
(revers
e
scale
)
Monopolistic Competition
Taste
Case Study: Ben & Jerry’s Ice Cream
Ad campaign reduces the perceived distance between Ben & Jerry’s and the cluster frontier.
Result: Campaign increased Pr(Choice-given-Consideration) for Ben & Jerry’s.
Conclusion: Pr(Choice) for Ben & Jerry’s increased
Ben & Jerry’s gained market share at the expense of other premium ice-creams.
Ben & Jerry’s launches an ad campaign around the phrase, “High calories are the price of great taste.”
Campaign causes consumers to believe that the previously-perceived frontier is unattainable. Consumers perceive a new frontier that reflects the tradeoff of taste with calories.
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Monopolistic Competition
The firm’s goal is to increase the Pr(Choice) for its brand. Whether the firm should focus on increasing Pr(Consideration) or increasing Pr(Choice|Consideration) depends on the probabilities.
Pr Choice Pr Consideration Pr Choice | Consideration
Example
Pr(Choice) = 1.0 and Pr(Choice|Consideration) = 0.1 Pr(Choice) = 0.1
Marketing effort aimed at increasing Pr(Consideration) is wasted. Firm should focus on increasing Pr(Choice|Consideration).
Example
Pr(Choice) = 0.1 and Pr(Choice|Consideration) = 1.0 Pr(Choice) = 0.1
Marketing effort aimed at increasing Pr(Choice|Consideration) is wasted. Firm should focus on increasing Pr(Consideration).
© Copyright 2007. Do not distribute or copy without permission. 171
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Long Run
D
MR
1. Profit maximizing output level
4. Zero economic profit
3. Cost per unit
2. Resulting price
5. Efficient output level
© Copyright 2007. Do not distribute or copy without permission. 172
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Short Run
D
MR
Firm increases Pr(Choice) for its brand via increase in Pr(Consideration) and/or increase in Pr(Choice | Consideration)
Demand (and MR) increases
D’
MR’
© Copyright 2007. Do not distribute or copy without permission. 173
4. Economic profit
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Short Run
D’
MR’
1. Profit maximizing output level
2. Resulting price
5. Efficient output level
3. Cost per unit
© Copyright 2007. Do not distribute or copy without permission. 174
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm Returning to the Long Run State
In the long run, either (a) competitors duplicate the firm’s brand innovation (e.g. cruise control), or (b) consumers realize that the supposed innovation has no real value (e.g. “ice” beers). Either way, demand (and MR) for the firm’s brand declines.
D’
MR’ D’’
MR’’
© Copyright 2007. Do not distribute or copy without permission. 175
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Short Run
D
MR
A competing firm causes an increase in Pr(Choice) for its brand. If that increase comes at the expense of this brand’s market share, then this firm’s demand decreases.
D’MR’
© Copyright 2007. Do not distribute or copy without permission. 176
4. Economic loss
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Short Run
D’MR’
5. Efficient output level
1. Profit maximizing output level
2. Resulting price
3. Cost per unit
© Copyright 2007. Do not distribute or copy without permission. 177
Monopolistic Competition
$
Q
ATC
MC
A Monopolistically Competitive Firm in the Short Run
D’MR’
D’’
MR’’
In the long run, either (a) this firm duplicates the competitor’s brand innovation, or (b) consumers realize that the competitor’s supposed innovation has no real value. Either way, demand (and MR) for this firm’s brand increases.
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Monopolistic Competition
Conclusions
1. Firms can make an economic profit or incur an economic loss in the short-run.
2. Firms make zero economic profit in the long run.
3. Firms are usually inefficient in both the short and long runs.
Monopolistic Competition or Perfect Competition?
If the summed expected present values of the economic profits due to marketing exceed the sum of the present values of the costs of marketing campaigns plus the summed expected present values of the economic losses due to competitors’ marketing campaigns, then a given industry will be monopolistically competitive rather than perfectly competitive.
Firms will continue to advertise in an attempt to garner short-run “bursts” of economic profit (e.g. Budweiser advertises during every Super Bowl).
© Copyright 2007. Do not distribute or copy without permission. 179
Long Run vs. Short Run ATC
Long Run vs. Short Run ATC
Thus far, the ATC curve we have seen has been constructed holding long run costs fixed. In the long run, all costs (including “fixed” costs) become variable.
We can now distinguish between short run ATC and long run ATC. The short run ATC (i.e. the ATC curve we have so far been using) assumes that long run costs are fixed. The long run ATC allows for long run costs to be variable.
© Copyright 2007. Do not distribute or copy without permission. 180
Long Run vs. Short Run ATC
$
Q
SRATC’s – each corresponds to a different level of fixed costs
LRATC
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Long Run vs. Short Run ATC
$
Q
1. Suppose the firm’s fixed costs are $100,000 per week. This is the firm’s SRATC function.
2. With fixed costs of $100,000 per week, the firm’s efficient output level is 20,000 units per week.
3. If, in the long run, the firm acquires more PP&E, its fixed costs will increase to $150,000 per week and the firm’s SRATC will move here.
4. With the additional PP&E, the firm’s efficient output level is 25,000 units per week.
LRATC
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Long Run vs. Short Run ATC
$
Q
In the long run, the firm acquires still more PP&E and so the firm’s SRATC again shifts.
With the additional PP&E, this is the firm’s new efficient output level.
This is the lowest ATC that can be attained in the long run. If the firm were to produce any more or any less output, or have any more or any less PP&E, the firm’s cost per unit would rise above this point.
We call this the long run efficient output level. To achieve long run efficiency, the firm would have to produce this much output and have the long run efficient quantity of PP&E.
LRATC
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Determinants of Industry Structure
Whether an industry will develop more to the extreme of monopoly or more to the extreme of perfect competition depends on two factors:
1. Firms’ LRATC functions, and
2. Market demand.
The LRATC function is determined by technology and the prices of factors. Market demand is determined by consumers.
The implication is that the factors that determine the degree of competition within an industry are independent of the skills of the managers involved. If market forces are such that a particular industry will evolve toward perfect competition, then it will be impossible for any single firm to successfully establish itself as a monopoly within that industry.
© Copyright 2007. Do not distribute or copy without permission. 184
Determinants of Industry Structure
$
Q
LRATC
1. Suppose all firms in the industry have LRATC’s that look like this.
6. In equilibrium, there must be 1,000 firms.500,000 / 500 = 1,000 firms
D
2. Suppose market demand is positioned here.
3. Without incurring a loss, the lowest price a firm could possibly charge is $10.
$10
4. To charge a price of $10 and not incur a loss, the firm must produce 500 units of output per day using the long run efficient quantity of fixed factors.
500
5. If all the firms in the industry charge $10, the quantity market demanded will be 500,000 units per day.
500,000
© Copyright 2007. Do not distribute or copy without permission. 185
Determinants of Industry Structure
$
Q
LRATC
1. Suppose all firms in the industry have LRATC’s that look like this.
6. In equilibrium, there can be only 1 firm.
D
2. Suppose market demand is positioned here.
3. Without incurring a loss, the lowest price a firm could possibly charge is $10.
$10
4. To charge a price of $10 and not incur a loss, the firm must produce 10,000 units of output per day using the long run efficient quantity of fixed factors.
10,000
5. If all the firms in the industry charge $10, the market quantity demanded will be 10,000 units per day.
© Copyright 2007. Do not distribute or copy without permission. 186
Government Intervention
Government intervention takes the following typical forms:
Price controls
By law, certain products cannot be sold below a price floor (e.g. workers are prohibited from selling their labor for less than the minimum wage) or above a price ceiling (e.g. state laws prohibit credit card companies from charging more than (in some states) 40% interest, rent control limits the rent landlords can charge in NYC).
Quotas
By law, producers may not sell more than a certain quantity of product per time period. Quotas are most often imposed on imports and infrequently imposed on domestically produced products.
Technical Regulations
By law, producers must produce products to a certain standard or via a certain method. Example: Cars sold in the U.S. must adhere to EPA regulations. Employers must adhere to OSHA safety regulations in the workplace.
© Copyright 2007. Do not distribute or copy without permission. 187
Government Intervention
Taxes
Types of taxes:
• Income tax (tax on wages and salaries, and interest and dividend income)• Sales tax (tax on the value of products sold – e.g. 6% of the sale)• Excise tax (tax on the quantity of products sold – e.g. 35 cents per gallon of gas)• Capital gains tax (tax on the difference between the sale and purchase prices)• Property tax (periodic tax on owned assets)• Tariff (tax on imports)
Classifications of taxes:
• Flat (called “poll” in the media; tax is same dollar amount for all)• Proportional (called “flat” in the media; tax is same percentage of income for all)• Progressive (tax is a greater percentage of income for higher income people)• Regressive (tax is a lesser percentage of income for higher income people)
© Copyright 2007. Do not distribute or copy without permission. 188
Who Pays Federal Personal Income Taxes?
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%Proportion of Taxpayers (by AGI)
Pro
po
rtio
n o
f T
ax R
even
ues
Federal Taxes 2004 Perfect Equity
© Copyright 2007. Do not distribute or copy without permission. 189
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Proportion of Taxpayers (by AGI)
Pro
po
rtio
n o
f T
ax R
even
ues
Federal Taxes 2004 Perfect Equity Social Security Taxes Medicare Taxes
Who Pays Wage Taxes?
© Copyright 2007. Do not distribute or copy without permission. 190
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%Proportion of Taxpayers (by AGI)
Pro
po
rtio
n o
f T
ax R
even
ues
Perfect Equity Federal Income Taxes Social Security Taxes
Medicare Taxes Capital Gains Taxes
Who Pays Wage and Capital Gains Taxes?
© Copyright 2007. Do not distribute or copy without permission. 191
What is the Expected Return on Social Security Taxes?Age Wage Prob(Alive) SS Tax SS Benefit Expected SS Tax/Benefit Age Wage Prob(Alive) SS Tax SS Benefit Expected SS Tax/Benefit21 $57,000 100.0% $7,068 ($7,068) 56 $284,452 89.2% $35,272 ($31,460)22 $59,679 99.9% $7,400 ($7,390) 57 $297,821 88.4% $36,930 ($32,638)23 $62,484 99.7% $7,748 ($7,727) 58 $311,819 87.5% $38,666 ($33,831)24 $65,421 99.6% $8,112 ($8,079) 59 $326,474 86.5% $40,483 ($35,033)25 $68,495 99.4% $8,493 ($8,447) 60 $341,818 85.5% $42,385 ($36,243)26 $71,715 99.3% $8,893 ($8,831) 61 $357,884 84.4% $44,378 ($37,456)27 $75,085 99.2% $9,311 ($9,233) 62 $374,704 83.2% $46,463 ($38,669)28 $78,614 99.0% $9,748 ($9,652) 63 $392,316 82.0% $48,647 ($39,878)29 $82,309 98.8% $10,206 ($10,089) 64 $410,754 80.7% $50,934 ($41,079)30 $86,178 98.7% $10,686 ($10,544) 65 $430,060 79.3% $53,327 ($42,268)31 $90,228 98.5% $11,188 ($11,019) 66 $450,273 77.8% $55,834 ($43,444)32 $94,469 98.3% $11,714 ($11,514) 67 $471,435 76.3% $58,458 ($44,604)33 $98,909 98.1% $12,265 ($12,030) 68 74.7% $119,580 $89,37534 $103,558 97.9% $12,841 ($12,569) 69 73.1% $125,200 $91,56335 $108,425 97.7% $13,445 ($13,130) 70 71.5% $131,085 $93,70236 $113,521 97.4% $14,077 ($13,715) 71 69.8% $137,246 $95,78637 $118,856 97.2% $14,738 ($14,325) 72 68.1% $143,696 $97,80938 $124,442 97.0% $15,431 ($14,961) 73 66.3% $150,450 $99,76739 $130,291 96.7% $16,156 ($15,623) 74 64.5% $157,521 $101,65240 $136,415 96.4% $16,915 ($16,313) 75 62.7% $164,925 $103,45941 $142,826 96.2% $17,710 ($17,031) 76 60.9% $172,676 $105,22442 $149,539 95.9% $18,543 ($17,778) 77 59.2% $180,792 $106,94343 $156,568 95.6% $19,414 ($18,555) 78 57.4% $189,289 $108,61344 $163,926 95.3% $20,327 ($19,363) 79 55.6% $198,186 $110,23145 $171,631 94.9% $21,282 ($20,203) 80 53.9% $207,500 $111,79446 $179,697 94.6% $22,282 ($21,075) 81 49.9% $217,253 $108,50047 $188,143 94.2% $23,330 ($21,979) 82 44.2% $227,464 $100,56848 $196,986 93.8% $24,426 ($22,915) 83 37.3% $238,154 $88,82849 $206,244 93.4% $25,574 ($23,882) 84 29.9% $249,348 $74,58250 $215,938 92.9% $26,776 ($24,881) 85 22.7% $261,067 $59,36651 $226,087 92.4% $28,035 ($25,909) 86 18.2% $273,337 $49,72552 $236,713 91.9% $29,352 ($26,967) 87 13.6% $286,184 $39,04653 $247,838 91.3% $30,732 ($28,052) 88 9.1% $299,635 $27,25454 $259,487 90.6% $32,176 ($29,164) 89 4.5% $313,718 $14,26855 $271,683 89.9% $33,689 ($30,301) 90 2.0% $328,462 $6,569
Assumptions: Age 21 income is average for Economics majors. Wages grow by inflation (3.5%) plus average growth in real wages for college graduates (1.2%). Burden is based on both halves of SS tax. Benefit at retirement is estimated by SSA and is assumed to grow by 4.7% annually. Mortality figures are for white males.
© Copyright 2007. Do not distribute or copy without permission. 192
What is the Expected Return on Social Security Taxes?
($60,000)
($40,000)
($20,000)
$0
$20,000
$40,000
$60,000
$80,000
$100,000
$120,000
21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90
Internal rate of return = 2.2%
SS benefits average $82,000 annually for 23 years.
© Copyright 2007. Do not distribute or copy without permission. 193
($500,000)
$0
$500,000
$1,000,000
$1,500,000
$2,000,000
$2,500,000
21 24 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 84 87 90
What is the Return on Social Security Taxes?
Investing both halves of the SS taxes at 12% expected return yields $18.5 million at retirement.
This sum can generate a stream of $2.4 million annual payments for the following 23 years.
© Copyright 2007. Do not distribute or copy without permission. 194
Government Intervention
Modeling Government Interventions
Shocks are modeled according to which group, consumers or producers, are impacted first by the shock. For example, an increase in income impacts consumers first and producers second (through the change in consumer behavior).
A single government intervention that impacts consumers and producers simultaneously is not modeled as a shock at all, but as the presence of a “third party” to the market. For example, a price ceiling impacts both consumers and producers at the same time as producers are not allowed to ask prices above the ceiling and consumers are not allowed to offer prices above the ceiling. However, technical regulations impact producers first because the regulations apply to the production process.
Interventions modeled as shocks: Technical regulationsInterventions not modeled as shocks: Price controls, quotas, taxes
© Copyright 2007. Do not distribute or copy without permission. 195
Price Controls
$
Q
D
S
Market for Labor
Employers demand labor
Workers supply labor
Labor employed in free market equilibrium
Free market equilibrium wage rate
Government imposed price floor
Labor employed with price floor
© Copyright 2007. Do not distribute or copy without permission. 196
Price Controls
$
Q
D
S
Market for Labor
Employers demand labor
Workers supply labor
Qd Qs
Unemployment = surplus of labor
Unemployment is not “people out of work.” It is “people who want work being out of work.”
Prior to the minimum wage, there was no unemployment (everyone who wanted a job at the prevailing wage had one).
The minimum wage causes unemployment by simultaneously enticing more people to offer their labor and fewer firms to desire labor.
© Copyright 2007. Do not distribute or copy without permission. 197
Price Controls
Money to pay for increased wages comes from one (or more) of three sources:
• Unemployed workers whose former earnings are now used to pay higher wages to those who are still employed
Workers who add less value per hour than the minimum wage are laid off. The workers who are retained are those who would have (via competition among employers) ended up earning above minimum wage anyway. Either the work they performed is eliminated (e.g. full-service gas stations, fast food drink dispensers), or they are replaced by machines (e.g. telephone operators, toll collectors, elevator operators), or the work load is placed on remaining higher productive employees (e.g. formerly hourly jobs becoming “salaried”).
• Consumers who now pay higher prices for the employers’ products
Higher prices for products that utilize minimum wage workers cause consumers to buy less, further reducing employment for these workers.
• Investors who now earn less return on firm’s stocks and bonds
Lower rate of return causes investors to invest in other firms, reducing the number of start-ups that employ low-skilled workers.
© Copyright 2007. Do not distribute or copy without permission. 198
Price Controls
• The more price-elastic (i.e. the more of a luxury) are low-skilled workers, the more of the increased wage will come from layoffs.
• The more price-inelastic (i.e. the more of a necessity) is a product, the more of the increased wage will come from consumers paying higher prices for the firm’s product.
• The more interest-rate-inelastic (i.e. the less risky) are a firm’s stocks and bonds, the more of the increased wage will come from investors receiving less return on their investments in the firm.
From which of these three sources, money required to pay the increased wage comes depends on elasticities:
© Copyright 2007. Do not distribute or copy without permission. 199
Price Controls
$
Q
D
S
Market for Apartments in NYC
Qs Qd
Housing shortage
Price ceiling on rent causes more people to want to rent than there are apartments available. This results in a chronic housing shortage.
The lowered rental price also reduces incentive for investors to build more housing units.
© Copyright 2007. Do not distribute or copy without permission.
Prices Ration GoodsAll things are scarce. Scarce resources will be rationed. The question is, by what mechanism? Who will be excluded?
Cap on interest rates?Rationed by risk. Higher risk borrowers excluded.
Cap on tuition?Rationed by talent. Less talented students
excluded.
Minimum wage?Rationed by skill. Less skilled workers excluded.
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
Minimum WageWhen we force an employer to pay a worker more than the job is worth, the job disappears.
40 years ago: Telephone operators30 years ago: Gas station attendants10 years ago: Fast food serversLast year: Pizza deliverers
What happens to workers whose jobs are eliminated? Those whose labor is worth more than minimum wage? Those whose labor is worth less than minimum wage?
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, and Bureau of Labor Statistics
College Education (1984-2004)
y = 0.003x + 0.02
R2 = 0.0002p = 0.95
0.0%
0.5%
1.0%
1.5%
2.0%
2.5%
3.0%
3.5%
4.0%
0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44
Min Wage as Fraction of Avg Hourly Wage
Un
emp
loym
ent
Rat
e
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, and Bureau of Labor Statistics
HS Education (1984-2004)
y = 0.23x - 0.03
R2 = 0.18p = 0.05
0.0%
1.0%
2.0%
3.0%
4.0%
5.0%
6.0%
7.0%
8.0%
9.0%
0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44
Min Wage as Fraction of Avg Hourly Wage
Un
emp
loym
ent
Rat
e
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, and Bureau of Labor Statistics
Less than HS Education (1984-2004)
y = 0.46x - 0.07
R2 = 0.26p = 0.02
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
14.0%
16.0%
0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44
Min Wage as Fraction of Avg Hourly Wage
Un
emp
loym
ent
Rat
e
© Copyright 2007. Do not distribute or copy without permission.
What percentage of workers earn minimum wage?
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
0%
1%
2%
3%
4%
5%
6%
7%
8%
16 - 19 20 - 24 25 +
Worker Age
% of Hourly Workers Earning Minimum Wage or Less
Source: Bureau of Labor Statistics, 2008
© Copyright 2007. Do not distribute or copy without permission.
Source: Bureau of Labor Statistics, 2008
0%
1%
2%
3%
4%
5%
6%
7%
8%
Part time Full time
Worker Status
% of Hourly Workers Earning Minimum Wage or Less
© Copyright 2007. Do not distribute or copy without permission.
0%
1%
2%
3%
4%
5%
6%
7%
8%
9%
10%
Service Occupations
Sales and Office Occupations
Production, Transportation
Management, Professional Occupations
Construction, Maintenance,
Natural Resources Occupations
Industry
% of Hourly Workers Earning Minimum Wage or Less
Source: Bureau of Labor Statistics, 2008
© Copyright 2007. Do not distribute or copy without permission.
Source: Bureau of Labor Statistics
Unemployment for Teenagers Relative to Adults (1964-2004)
1.5
1.7
1.9
2.1
2.3
2.5
2.7
2.9
3.1
3.3
0.3 0.32 0.34 0.36 0.38 0.4 0.42 0.44 0.46 0.48Minimum Wage as Percentage of Average Hourly Earnings
Un
emp
loym
ent
Po
pu
lati
on
Rat
io f
or
16-1
9 Y
ear
Old
s as
Per
cen
tag
e o
f 20
-64
Yea
r O
lds
Minimum Wage as Percentage of Average Hourly Wage
Unem
plo
ym
ent
Popu
lati
on
Rati
o f
or
16-1
9
Year
Old
s as
a P
erc
enta
ge o
f R
ati
o f
or
20
-64
Year
Old
s
© Copyright 2007. Do not distribute or copy without permission.
Source: Bureau of Labor Statistics
Minority vs. Non-Minority Household Income (1970-2001)
y = -0.33x + 0.73
R2 = 0.15
55%
57%
59%
61%
63%
65%
67%
69%
32% 34% 36% 38% 40% 42% 44% 46% 48%
Minimum Wage as Fraction of Average Hourly Earnings
Rat
io o
f M
edia
n H
ou
seh
old
In
com
es
(Bla
ck/W
hit
e)
© Copyright 2007. Do not distribute or copy without permission.
How to Pay for a Minimum Wage
There are three ways in which a firm can find additional money to pay workers.
1. Layoff some workers and shift their wages to the remaining workers.
2. Keep all the workers and pay for the additional wages out of profits.3. Keep all the workers and pay for the additional wages by raising prices.
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
Source: Bureau of Labor Statistics, California Department of Finance
Comparison of Minimum Wage to CA Inflation (1970-2004)
y = 0.44x - 0.14
R2 = 0.28p = 0.001
0%
2%
4%
6%
8%
10%
12%
14%
16%
35% 37% 39% 41% 43% 45% 47% 49% 51% 53%
Real CA Min Wage as % of Real US Avg Hourly Wage
CA
In
flat
ion
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But, we have to do something about the distribution of income.
The rich are getting richer while the poor get poorer!
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, U.S. Bureau of the Census, 2009, Table 668.
% of Households in Each Income Bracket (2006$)
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Source: Statistical Abstract of the United States, U.S. Bureau of the Census, 2009, Table 668.
% of Households in Each Income Bracket (2006$)
From 1980 to 1990, the number of households with purchasing power of at least $75,000 grew while the number with purchasing power less than $75,000 declined.
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, U.S. Bureau of the Census, 2009, Table 668.
% of Households in Each Income Bracket (2006$)
From 1990 to 2006, the number of households with purchasing power of at least $75,000 grew while the number with purchasing power less than $75,000 declined.
© Copyright 2007. Do not distribute or copy without permission.
Source: Statistical Abstract of the United States, U.S. Bureau of the Census, 2008, Table 675.
1980 The top 20% of households earned 44% of all income.
2003 The top 20% of households earned 50% of all income.
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission.
In which world would each person rather live?
(prices are the same in the two worlds)
Household Income in World #1 Household Income in World #2Person 1 $32,000 $40,000Person 2 $33,500 $41,875Person 3 $35,000 $43,750Person 4 $36,500 $45,625Person 5 $38,000 $47,500Person 6 $39,500 $49,375Person 7 $41,000 $51,250Person 8 $42,500 $53,125Person 9 $44,000 $77,000
Person 10 $45,500 $79,625
In world #1, Person 10 earns 10% of all income.In world #2, Person 10 earns 15% of all income.
Minimum Wage
© Copyright 2007. Do not distribute or copy without permission. 219
Quotas
$
Q
D
S
U.S. Market for Foreign Cars
Foreign car demand (by American consumers)
Foreign car supply (from foreign producers)
Free market equilibrium quantity
Free market equilibrium price
At the quota limit, consumers are willing to pay this price for foreign cars.
Government imposed quota on unit sales
At the price consumers are willing to pay, foreign producers want to offer this many cars, but can’t because of the quota.
© Copyright 2007. Do not distribute or copy without permission. 220
Technical Regulations
$
Q
D
S
Market for Gasoline The federal government requires all gasoline sold in major urban areas to contain a certain quantity of ethanol.
Ethanol is more expensive to produce than gasoline (ironically, the production of 1 gallon of ethanol requires the burning of 1.2 gallons of gasoline).
Free market equilibrium quantity
Free market equilibrium price
S’
This regulation increases the cost of production for gasoline, shifting supply to the left.
The market price of gasoline rises and the quantity sold falls.
© Copyright 2007. Do not distribute or copy without permission. 221
Taxes
All taxes can be treated as sales taxes
A wage tax is a tax on the sales of labor.
A property tax is a tax that is paid every year on the past sale of a physical asset.
Interest and dividend taxes are property taxes on financial assets.
A capital gains tax is a sales tax on a re-sold asset.
The one from whom a tax is collected is not the same as the one who pays the tax
While the law states from whom a tax is collected, the government is powerless to determine who pays the tax. Who pays the tax is determined by market forces and is found by comparing the price of the taxed item before and after imposition of the tax.
The split in the tax between the consumer and producer is called the tax burden.
© Copyright 2007. Do not distribute or copy without permission. 222
Taxes
When the government imposes a tax, two prices result:
1. The price the consumer pays (the price of the product plus the tax)
2. The price the producer receives (the price the consumer pays less the tax)
For an excise tax, the relationship between the two prices is:
Pc = Pp + Tax per unit
For a sales tax, the relationship between the two prices is:
Pc = Pp (1 + Tax Rate)
© Copyright 2007. Do not distribute or copy without permission. 223
Taxes
$
Gallons/day
D
S
Market for Gasoline
$1.50
380 m.
1. Prior to the tax, the equilibrium price is $1.50 per gallon, and the equilibrium quantity is 380 million gallons per day.
The steep demand curve reflects the fact that consumers regard gasoline as a necessity.
2. The government imposes a $0.50 per gallon tax.
This distance is $1.50
This distance is $0.50
$0.50 separation between Pc
and Pp
3. The resulting consumer price is $1.90 and the resulting producer price is $1.40
$1.90
$1.40
4. The market is in equilibrium
because both Qs and Qd are 370
m.
370 m.
© Copyright 2007. Do not distribute or copy without permission. 224
Producers pay $0.10 of the $0.50 tax, for a total tax payment of($0.10)(370 m.) = $37 million per day
Consumers pay $0.40 of the $0.50 tax, for a total tax payment of($0.40)(370 m.) = $148 million per day
Taxes
$
Gallons/day
D
S
Market for Gasoline
$1.50
$1.90
$1.40
370 m.
© Copyright 2007. Do not distribute or copy without permission. 225
Taxes
$
Cars/year
D
S
Market for Luxury Cars
$40,000
100,00
0
1. Prior to the tax, the equilibrium price is $40,000 per car, and the equilibrium quantity is 100,000 cars per year.
The flat demand curve reflects the fact that consumers regard these cars as luxuries
2. The government imposes a $5,000 per car tax.
This distance is $40,000
This distance is $5,000
$5,000 separation between Pc and
Pp
3. The resulting consumer price is $40,500 and the resulting producer price is $35,500 $40,50
0
$35,500
4. The market is in equilibrium
because both Qs and Qd are
70,000.
70,000
© Copyright 2007. Do not distribute or copy without permission. 226
Consumers pay $500 of the $5,000 tax, for a total tax payment of($500)(70,000) = $35 million per year
Producers pay $4,500 of the $5,000 tax, for a total tax payment of($4,500)(70,000) = $315 million per year
Taxes
$
Cars/year
Market for Luxury Cars
D
S
$40,50
0
$35,500
$40,000
70,000
© Copyright 2007. Do not distribute or copy without permission. 227
Taxes
Conclusion:
From whom the tax is collected is irrelevant. What is important is who pays the tax. The law can only specify from whom the tax is collected. Market forces determine who pays the tax.
Example:
Social Security wage tax. The law specifies that the employer “pays” half of the tax (7.5%) and that the worker “pays” the other half (7.5%). In fact, the law is stating from whom the tax is collected. Who really bears the burden of the tax depends on the elasticities of labor demand and labor supply.
Data indicate that the supply of labor tends to be inelastic (i.e. as wages fall a given percentage, a proportionally smaller percentage of people drop out of the workforce), and that the demand for labor tends to be more elastic the less skilled is the labor (i.e. the less skilled the labor is, the more the firm regards the labor as a luxury).
© Copyright 2007. Do not distribute or copy without permission. 228
Taxes
$
Worker-hours/year
Market for Lower Skilled Labor
D
S $
Worker-hours/year
Market for Higher Skilled Labor
D
S
Portion of Social Security wage tax paid by the employerPortion of Social Security wage tax paid by the employee
© Copyright 2007. Do not distribute or copy without permission. 229
Quantitative Analysis of a Price Control
You have analyzed industry data for the market for gasoline and estimated the following demand and supply functions (where Q is millions of gallons per day).
ˆˆDemand: 1187.08 3.12 dP Q
ˆˆSupply: 302.52 0.80 sP Q
1. Find the estimated free market price and equilibrium quantity of gasoline.
P = $1.48 per gallon, Q = 380 million gallons
2. The government is debating imposing a $1.25 per gallon price ceiling on gasoline. Estimate the impact of the price ceiling on the market.
1187.08 1.25ˆ ˆ1.25 1187.08 3.12 380.073.12d dQ Q
302.52 1.25ˆ ˆ1.25 302.52 0.80 379.710.80s sQ Q
Shortage of 360,000 gallons per day.
© Copyright 2007. Do not distribute or copy without permission. 230
Quantitative Analysis of a Tax
3. An alternate proposal calls for the imposition of a $0.40 per gallon tax on gasoline. Estimate the impact of the tax on the market and also estimate the burden of the tax on consumers and on producers.
Two conditions for equilibrium
Tax per gallond s
c p
Q Q
P P
1187.08ˆ ˆ1187.08 3.12 3.12
302.52ˆ ˆ302.52 0.80 0.80
cc d d
pp s s
PP Q Q
PP Q Q
302.521187.08ˆ ˆ 7.25 3.93.12 0.80
Tax per gallon 7.25 3.9 0.40
$1.40, $1.80, 379.90
pcd s c p
c p p p
p c
PPQ Q P P
P P P P
P P Q
Consumers pay $1.80 – $1.48 = $0.32 of the tax.
Producers pay $1.48 – $1.40 = $0.08 of the tax.
© Copyright 2007. Do not distribute or copy without permission. 231
Quantitative Analysis of a Subsidy
You have analyzed industry data for the market for higher education and estimated the following demand and supply functions (where Q is full-time equivalent students per semester in millions, and P is tuition, fees, room and board).
ˆˆDemand: 32796.8 1781 dP Q
ˆˆSupply: 2595.2 984 sP Q
1. Find the estimated free market price and equilibrium quantity.
P = $10,000 per semester, Q = 12.8 million FTE students
2. To ease the burden of tuition, the government is debating providing grants to all full-time students equal to 10% of their semester tuition. State the two conditions required for equilibrium.
Two conditions for equilibrium
1 Tax Rate 0.9d s
c p c p
Q Q
P P P P
© Copyright 2007. Do not distribute or copy without permission. 232
Quantitative Analysis of a Subsidy
3. Estimate the impact of the subsidy on the market and also estimate the share of the subsidy for consumers and for producers.
32796.8ˆ ˆ32796.8 1781 1781
2595.2ˆ ˆ2595.2 984 984
cc d d
pp s s
PP Q Q
PP Q Q
2595.232796.8ˆ ˆ 15525 0.551781 984
0.9 0.9 15525 0.55
$9,332, $10,369, 13.175
pcd s p c
c p c c
c p
PPQ Q P P
P P P P
P P Q
Students receive $10,000 – $9,332 = $668 of the subsidy.
Colleges absorb $10,369 – $10,000 = $369 of the subsidy.
Two conditions for equilibrium
1 Tax Rate 0.9d s
c p c p
Q Q
P P P P
© Copyright 2007. Do not distribute or copy without permission. 233
Macroeconomics
Macroeconomic analysis looks at economic phenomena that impact broad sectors of the economy.
Microeconomics focuses on individual firms, consumers, and industries, and analyzes the markets for particular products.
Macroeconomics treats all consumers as a single group, all producers as a single group, and analyzes production in general.
© Copyright 2007. Do not distribute or copy without permission.
In the following slides, you will be asked a series of questions.
Answer honestly – only your opinion matters.
You will not be asked to share your results.
Answer by writing the number corresponding to your answer.
© Copyright 2007. Do not distribute or copy without permission.
Military service should be voluntary – no draft.
Yes = 2Maybe = 1 No = 0
© Copyright 2007. Do not distribute or copy without permission.
Government should not control radio, TV, the press,or the Internet.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
Repeal regulations on sex by consenting adults.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
Drug laws do more harm than good. Repeal them.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
Let peaceful people cross borders freely.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
Businesses and farms should operate without government subsidies.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
People are better off with free trade than with tariffs.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
Minimum wage laws cause unemployment. Repeal them.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
End taxes. Pay for services with user fees.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
All foreign aid should be privately funded.
Yes = 2Maybe = 1No = 0
© Copyright 2007. Do not distribute or copy without permission.
What are “Liberalism” and “Conservatism”?
Team up with the person next to you. Between the two of you, come up with a definition for “liberalism” and a definition for “conservatism.”
Each definition should be no more than one or two sentences.
© Copyright 2007. Do not distribute or copy without permission.
Formal Definitions: “Liberalism” and “Conservatism”
Webster’s Collegiate Dictionary
Liberalism is “a political philosophy based on belief in…the essential goodness of the human race, and on the autonomy of the individual, and (stands) for the protection of political and civil liberties.”
Conservatism is “a political philosophy based on tradition and social stability, stressing established institutions, and preferring gradual development to abrupt change.”
© Copyright 2007. Do not distribute or copy without permission.
Representative Ted Weiss (D, NY)“Liberals believe (that) government has an obligation to provide equal educational and job opportunities for all. To those whose survival requires economic assistance, government should extend a helping hand. Individual liberties and human rights must be safeguarded from and by government.”
Contradictions
Webster’s Collegiate DictionaryLiberalism is “a political philosophy based on belief in…the essential goodness of the human race, and on the autonomy of the individual, and (stands) for the protection of political and civil liberties.”
© Copyright 2007. Do not distribute or copy without permission.
Webster’s Collegiate DictionaryConservatism is “a political philosophy based tradition and social stability, stressing established institutions, and preferring gradual development to abrupt change.”
Contradictions
Senator John Tower (R, TX)“Conservatives have more faith in people than in government institutions, and would keep government out of issues that can be handled in the private sector.”
© Copyright 2007. Do not distribute or copy without permission.
Drug War
What Issues are “Liberal” versus “Conservative”?
“Conservative”
“Liberal”
Universal Health Care
Minimum WageReduced TaxesGay MarriageMandatory Prayer in Public School
Prohibit Prayer in Public SchoolFree Trade
© Copyright 2007. Do not distribute or copy without permission.
What Issues are “Liberal” versus “Conservative”?
“Conservative”
“Liberal”
Universal Health Care
Minimum Wage
Reduced Taxes
Gay Marriage
Mandatory Prayer in Public School
Drug War
Prohibit Prayer in Public School
Free Trade
Rather than thinking in terms of “liberal” and “conservative”, think in terms of “more individual
freedom” vs. “less individual freedom”.
© Copyright 2007. Do not distribute or copy without permission.
Two spheres in which humans exercise freedoms:Social sphere where they choose how to behave
Economic sphere where they enter into contracts with others
The two spheres are not necessarily independent.
Choice to marry a goat = social choiceChoice to buy foreign goods = economic choice
Choice to do drugs = social choiceChoice to buy drugs = economic choice
Less Individual Freedom vs. More Individual Freedom
Less Freedom More Freedom
Universal Health Care
Minimum Wage
Reduced Taxes
Gay Marriage
Mandatory Prayer in Public School
Drug War
Prohibit Prayer in Public School
Free Trade
© Copyright 2007. Do not distribute or copy without permission.
Better terms are:
Control vs. FreedomCentralized Decision Making vs. Decentralized
Decision MakingPower from Above vs. Power from BelowSlavery vs. Liberty
The terms “liberal” and “conservative” are ambiguous.
© Copyright 2007. Do not distribute or copy without permission.
Less Social Freedom
More Social Freedom
More Economic Freedom
Less Economic Freedom
Less Individual Freedom vs. More Individual Freedom
Universal Health Care
Minimum Wage
Reduced Taxes
Gay Marriage
Mandatory Prayer in Public School
Drug War
Prohibit Prayer in Public School
Free Trade
© Copyright 2007. Do not distribute or copy without permission.
Who is “Liberal” and Who is “Conservative”?
“Conservative”
“Liberal”
© Copyright 2007. Do not distribute or copy without permission.
Who is “Liberal” and Who is “Conservative”?
Socially “Conservative”
Economically “Conservative”
Economically “Liberal”
Socially “Liberal”
© Copyright 2007. Do not distribute or copy without permission.
Socially “Conservative”
Socially “Liberal”
Economically “Conservative”
Economically “Liberal”
Economic Freedom
Personal Freedom
© Copyright 2007. Do not distribute or copy without permission.
Economic Freedom
Personal Freedom
“Democrat”
“Republican” Classical Liberal
Authoritarian
Centrist5
0
10
50 10
© Copyright 2007. Do not distribute or copy without permission.
What kind of society do we want to live in?
Take a few minutes to list what you want from a well-functioning social order.
Keep the list abstract.
“Prosperity” not “adequate per-capita income”
© Copyright 2007. Do not distribute or copy without permission.
What is more important?
Copy the list and identify the four items of highest priority (in your opinion).
Write a #1 next to the highest priority item, #2 next to the second highest priority item, etc.
© Copyright 2007. Do not distribute or copy without permission.
Does the importance change?
You have identified the four most important goals/features of a society.
Will these goals/features always be the most important?
Consider: Crime vs. Car PollutionIndicate the four most important goals/features of a society when
considering each of these two problems.
Indicate the four least important goals/features of a society when considering each of these two problems.
© Copyright 2007. Do not distribute or copy without permission.
Consensus
Divide into groups.Discuss your rankings and come to a consensus.
Note main areas of agreement and disagreement.
© Copyright 2007. Do not distribute or copy without permission. 262
Market Systems
Market systems are categorized according to the degree of separation between the ones who make decisions and the ones who must endure the consequences of the decisions.
Capitalism Communism
Market socialism
Planned socialism
Free markets
Less separation between decisions and consequences
Command markets
Greater separation between decisions and consequences
© Copyright 2007. Do not distribute or copy without permission. 263
Market Systems
Capitalism
No government intervention. No transactions are illegal. Not anarchy – government is necessary to protect property rights. Individuals are motivated to maximize profit. Called “capitalism” because individuals, not government, own the means of production (i.e. capital – buildings, land, machinery).
Market Socialism
Significant government intervention. Some transactions are illegal. Output levels and prices are determined by market forces of demand and supply. Individuals are motivated to maximize profit. Government owns means of production, but people own all other property. Government seizes profits for use for “good of society.”
Planned Socialism
Significant government intervention. Many transactions are illegal. Output levels and prices are set by the government. Individuals are motivated to hit production targets. Government owns means of production and virtually all other property. Government directs production and spending for “good of society.”
© Copyright 2007. Do not distribute or copy without permission. 264
Market Systems
Communism
Total government intervention. Transactions do not exist. Money does not exist. Government owns everything. No personal property. People work for “free” and receive what they need for “free” from the government.
What we call “communism” in the common usage of the word is really economic planned socialism mixed with political totalitarianism. Communism in the economic sense is more akin to the common usage of the word “commune.”
© Copyright 2007. Do not distribute or copy without permission. 265
Political Systems
Political systems can also be categorized according to the degree of separation between the ones who make decisions and the ones who must endure the consequences of the decisions.
Anarchy Dictatorship
Democracy Republic
Political Freedom
Less separation between decisions and consequences
Political Oppression
Greater separation between decisions and consequences
© Copyright 2007. Do not distribute or copy without permission. 266
Political Systems
The choice of political system hinges on whether one believes that
1. Government derives its power from the people, or
2. People are granted power by the government.
For example, one can argue tax policy from one of two starting points. Either:
1. Income belongs to the people and the government confiscates part of that income (in the form of taxes) to be used for the public good, or
2. Income belongs to the government and the government allows people to keep part of that income (in the form of tax relief) to be used for their own purposes.For example, one can argue patents from one of two starting points. Either:
1. Intellectual property belongs to the inventor and the government protects the inventor’s IP through the use of patents, or
2. Intellectual property belongs to the government and the government allows the inventor to earn a profit off of the IP through the use of patents.
© Copyright 2007. Do not distribute or copy without permission. 267
Political Systems
When making social decisions, power derives from…
the Individual the Government
When making economic decisions, power derives
from…
the IndividualLibertarianism
(“Classical Liberalism”)
“Conservatism”
the Government “Liberalism” Populism
Political Classifications According to the Origin and Application of the Power of Decision Making
© Copyright 2007. Do not distribute or copy without permission. 268
Political Systems
A vote in the political arena is the equivalent of a purchase in the economic arena.
Political vote
1 person = 1 vote
Vote does not reflect the intensity of the voter’s desire
There is no opportunity cost to the vote vote is not a “real” measure
There is one winner up to 50% of the voters are left with a decision they did not want
Economic vote
1 person = multiple votes (depending on person’s abilities)
Vote reflects the intensity of the voter’s desire
There is an opportunity cost to the vote vote is a “real” measure
There are multiple winners potentially every voter is left with a decision he wants
© Copyright 2007. Do not distribute or copy without permission. 269
Market Systems
Free market system Command market system
Singapore (1.6)
Index of Economic Freedom (2005 Scores)
1.0
5.0
United States (1.9)Japan (2.5)Canada (1.9)
Germany (2.0)
United Kingdom (1.8)
France (2.6)Sweden (1.9)
Spain (2.3)Italy (2.3)
Saudi Arabia (3.0)
Poland (2.5)
Mexico (2.9)
Russia (3.6)India (3.5)
North Korea (5.0)
China (3.5)
Hong Kong (1.4)
Iran (4.2)
© Copyright 2007. Do not distribute or copy without permission. 270
Market Systems
© Copyright 2007. Do not distribute or copy without permission. 271
Market Systems
$0
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
$35,000
$40,000
$45,000
1 2 3 4 5
Index of Economic Freedom (1=Free, 5=Repressed)
Per
-Cap
ita
Inco
me
(US
$, P
PP
Eq
uiv
alen
t)
U.S.
Luxembourg
© Copyright 2007. Do not distribute or copy without permission. 272
Market Systems
Income vs. Equity
Historically, individuals have tended to “rate” economic systems according to their subjective assessments of both income and equity.
Formally, income is measured as “income per capita,” or “GDP per capita,” and equity is measured via the Gini coefficient.
Gini coefficient
Scale is 0 to 100.
0 indicates perfect equality All people earn same income.
100 indicates perfect inequality One person earns all the income, everyone else earns nothing.
Gini coefficient ignores income level and looks only at income distribution.
© Copyright 2007. Do not distribute or copy without permission. 273
$0
$5,000
$10,000
$15,000
$20,000
$25,000
$30,000
$35,000
$40,000
$45,000
10.0 20.0 30.0 40.0 50.0 60.0 70.0
Gini Coefficient (0=Equitable, 1=Inequitable)
Per
-Cap
ita
Inco
me
(US
$, P
PP
Eq
uiv
alen
t)
Market Systems
Finland
Brazil
South Africa
Cyprus
U.S.
Luxembourg
© Copyright 2007. Do not distribute or copy without permission. 274
Production Possibilities Frontier
Because an economy has limited resources (land, energy, labor, technology, raw materials), the amount of output the economy can produce is limited.
Further, because of economies and diseconomies of scale, the tradeoffs between production of different types of products is limited.
We represent these limits on production by the production possibilities frontier. The PPF shows all combinations of products an economy is capable of producing.
The PPF does not represent desires only possibilities.
© Copyright 2007. Do not distribute or copy without permission. 275
Production Possibilities Frontier
Durables
Non-d
ura
ble
s
Consider an economy that produces two types of goods: durables and non-durables
Economy has enough resources to produce any combination of products along the PPF line.
Combinations of products within the PPF represent unemployment.
Combinations of products outside the PPF are unattainable.
© Copyright 2007. Do not distribute or copy without permission. 276
Production Possibilities Frontier
Durables
Non-d
ura
ble
s
PPF is non-linear due to specialization and congestion.
1. Suppose the economy is producing this combination of durables and non-durables.
3. The economy was producing so many durables that there was a lot of congestion in the durables industry moving resources out of durables production caused a relatively small decline in durables output.
2. If the economy reduces production of durables, the freed-up resources can be employed in the production of non-durables.
4. The economy was producing so few non-durables that there were many opportunities for specialization in the non-durables industry moving resources into non-durables production caused a relatively large increase in non-durables output.
© Copyright 2007. Do not distribute or copy without permission. 277
Production Possibilities Frontier
Durables
Non-d
ura
ble
s
Technological and resource changes move the PPF.
Over time, improvements in technology and the discovery/creation of new resources causes the PPF to shift out.
The economy can now produce combinations of products that were previously unattainable.
Levels of productivity that used to represent full employment now represent unemployment.
© Copyright 2007. Do not distribute or copy without permission. 278
Measures of Productivity: GDP and GNP
The two major measures of productivity are GDP and GNP.
Gross Domestic Product (GDP)
The value of all final goods and services produced by firms within a country in a given year.
Gross National Product (GNP)
The value of all final goods and services produced by a country’s firms in a given year.
Domestic Foreign
Domestic Domestic GDPDomestic GDP Foreign GNP
ForeignDomestic GNP Foreign GDP
Foreign GDP
Res
iden
ce o
f F
irm
Nationality of Firm
© Copyright 2007. Do not distribute or copy without permission. 279
Measures of Productivity: GDP and GNP
© Copyright 2007. Do not distribute or copy without permission. 280
Measures of Productivity: GDP and GNP
© Copyright 2007. Do not distribute or copy without permission. 281
Measures of Productivity: GDP and GNP
© Copyright 2007. Do not distribute or copy without permission. 282
Measures of Productivity: GDP and GNP
© Copyright 2007. Do not distribute or copy without permission. 283
Measures of Productivity: GDP and GNP
$0
$10,000
$20,000
$30,000
$40,000
$50,000
$60,000
$70,000
$80,000
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© Copyright 2007. Do not distribute or copy without permission. 284
Measures of Productivity: GDP and GNP
GDP Growth Rate (2003 to 2004)
0%
50%
100%
150%
200%
250%
300%
350%
400%
Zim
babw
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Angola
Burm
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Afg
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tan
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Turk
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Uzbekis
tan
Iran
Turk
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Mozam
biq
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Venezuela
Chad
Congo
Dom
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an R
epublic
© Copyright 2007. Do not distribute or copy without permission. 285
Measures of Productivity: GDP and GNP
RGDP Growth Rate (2003 to 2004)
0%
5%
10%
15%
20%
25%
30%
Afg
hanis
tan
Turk
menis
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Equato
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Chad
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Arg
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Bhuta
n
Bots
wana
India
San M
arino
Russia
© Copyright 2007. Do not distribute or copy without permission. 286
Measures of Productivity: GDP and GNP
2008 FiguresGDP (trillions, US$,
PPP)Per-Capita GDP Growth RGDP Inflation
Public Debt Share of GDP
Unemployment
World $69.60 $10,400 3.1% 1% to 20% 30.0%
United States $14.26 $46,900 1.1% 3.8% 61% 7.2%
China $7.97 $6,000 9.0% 5.9% 16% 4.0%
Japan $4.33 $34,000 -0.7% 1.4% 173% 4.0%
Germany $3.67 $35,400 1.0% 2.7% 64% 7.8%
United Kingdom $2.26 $36,500 0.7% 3.6% 52% 5.6%
France $2.13 $33,200 0.3% 2.8% 68% 7.4%
Canada $1.30 $39,100 0.4% 2.4% 64% 6.2%
Mexico $1.56 $14,200 1.3% 5.1% 19% 4.0%
© Copyright 2007. Do not distribute or copy without permission. 287
Measures of Productivity: GDP and GNP
Final Goods and Services
By measuring the value of final goods and services, we automatically include the values of the intermediate goods and services.
Economic Costs of Processes
Extract Iron Ore Smelt Steel Stamp Parts Assemble Refrigerator
$175 $225 $125 $200
Sale Prices
Iron Ore Smelted Steel Stamped parts Refrigerator
$175 $175 + $225 $175 + $225 + $125 $175 + $225 + $125 + $200
The price of the refrigerator includes the values of all the intermediate goods that went into the production of the refrigerator.
© Copyright 2007. Do not distribute or copy without permission. 288
Circular Flow of Income and Spending
Households
Firms
Labor
Wages and Salaries
Products
Payments for Products
Risky return
Lending
Risky return
Savings
Financial Institution
s
Savings
Safe return
Labor market
Goods market
Financial markets
Foreign Markets
Financial intermediation
Financial disintermediation
© Copyright 2007. Do not distribute or copy without permission. 289
Circular Flow of Income and Spending
The circular flow model implies that there are two methods for accounting for all economic activity within a country.
1. Add up all the spending on final goods and services (the expenditures approach).
2. Add up all the income earned (the income approach).
© Copyright 2007. Do not distribute or copy without permission. 290
Expenditure Approach to GDP
GDP = C + I + G + X – M
C = Personal Consumption Expenditures
= Consumption of Durable Goods
+ Consumption of Non-durable Goods
+ Consumption of Services
I = Gross Private Domestic Investment
= Non-Residential Fixed Investment
+ Residential Fixed Investment
+ Changes in Private Inventories
© Copyright 2007. Do not distribute or copy without permission. 291
Expenditure Approach to GDP
GDP = C + I + G + X – M
G = Government Consumption and Investment
= Federal Government Spending on Defense
+ Federal Government Spending on Non-defense
+ State and Local Government Spending
X = Exports
= Exports of Goods
+ Exports of Services
M= Imports
= Imports of Goods
+ Imports of Services
© Copyright 2007. Do not distribute or copy without permission. 292
Expenditure Approach to GDP
Expenditures Components of GDP (2004)
-$4.0
-$2.0
$0.0
$2.0
$4.0
$6.0
$8.0
$10.0
C I G X M
Tril
lio
ns
© Copyright 2007. Do not distribute or copy without permission. 293
Expenditure Approach to GDP
Expenditures Components of GDP (2004)
$0.0
$1.0
$2.0
$3.0
$4.0
$5.0
$6.0
C (
dura
bles
)
C (
non-
dura
bles
)
C (
serv
ices
)
I (n
on-r
esid
entia
l)
I (r
esid
entia
l)
I (Δ
inve
ntor
ies)
G (
defe
nse)
G (
non-
defe
nse)
G (
stat
e &
loca
l)
X (
good
s)
X (
serv
ices
)
M (
good
s)
M (
serv
ices
)
Tril
lio
ns
© Copyright 2007. Do not distribute or copy without permission. 294
Expenditure Approach to GDP
Expenditure Components of GDP (2004)
C (durables)
C (non-durables)
C (services)
I (non-residential)
I (residential)
I (Δ inventories)
G (defense)
G (non-defense)
G (state & local)
NX (goods) (negative)
NX (services)
© Copyright 2007. Do not distribute or copy without permission. 295
Economic Activity vs. Transactional Activity
The intent of GDP is to measure economic activity. Economic activity is not the same as transactional activity.
Transactional activity includes all activity in which dollars change hands.
Economic activity includes only those activities in which production takes place.
Economists are concerned with economic activity because it is the production of new goods and services, not the transfer of existing goods and services that benefits people.
Note: You might argue that “moving a car from a seller’s home in Maine to the buyer’s home in Florida” represents economic value. It is the physical moving that has value, not the transfer of ownership.
© Copyright 2007. Do not distribute or copy without permission. 296
Transactions Excluded from GDP
Things not included in GDP
1. Spending in the current year on products produced in prior years.
Example:
Buy a new book on Amazon that was printed this year. This transaction counts as GDP (Consumption) because the book was produced in the current year.
Buy a new book on Amazon that was printed last year. This transaction does not count as GDP because the book was counted last year when it was produced (as Changes in Inventory)
Buy a used book on Amazon that was printed last year. This transaction does not count as GDP because the book was counted last year (as Consumption) when the original owner purchased it.
With the intent of measuring production, not transactions, certain transactions are excluded from GDP calculations.
© Copyright 2007. Do not distribute or copy without permission. 297
Transactions Excluded from GDP
Things not included in GDP
2. Spending on “used” products that are re-sold.
Example:
Buy a new book on Amazon that was printed this year. This transaction counts as GDP (Consumption) because the book was produced in the current year.
Buy a used book on Amazon that was printed this year. This transaction does not count as GDP because the book was counted earlier in the year (as Consumption) when the original owner purchased it.
© Copyright 2007. Do not distribute or copy without permission. 298
Transactions Excluded from GDP
Things not included in GDP
3. Spending on intermediate products.
Example:
Buy new tires from a car dealer that were produced this year. The value of the tires counts as GDP (Consumption) because the tires were produced in the current year.
Car dealer buys new tires that were produced this year, puts them on a car and offers the car for sale. The value of the tires on the car does not count as GDP because the value will be counted, as part of the value of the car, when the car is sold.
© Copyright 2007. Do not distribute or copy without permission. 299
Transactions Excluded from GDP
Things not included in GDP
4. Spending on financial assets.
Example:
Buy a share of stock. The stock is neither a good nor a service, but a financial asset; the purchase of the stock is the transformation of a safe, liquid asset that yields no return (cash) into a risky, less liquid asset that yields an expected return (stock).
© Copyright 2007. Do not distribute or copy without permission. 300
Transactions Excluded from GDP
Things not included in GDP
5. Full value of government services.
Example:
Government provides interstate road system. The cost of building and maintaining the system is included in GDP, but, because drivers are not charged to use the roads, the value of the road system (which is likely more than the cost) is not included in GDP.
If the road system were private and drivers paid a market-determined price to use the roads, then the full value of the roads would be included in GDP.
Note: If drivers were charged to use the road system, they would have less money to spend on other things, so much of the “increase” in GDP due to proper accounting of roads would be offset due to decreased consumption of other goods and services.
© Copyright 2007. Do not distribute or copy without permission. 301
Invisible Transactions That Should Be Included in GDP
Things not included in GDP that should be included
1. “Under-the-table” spending on labor.
Example:
Hire a babysitter. This transaction should count as GDP (Consumption) because babysitting is a service. But, because the babysitter does not declare the money as income and because the parents do not claim the money as a child-care tax deduction, the government has no way of knowing the transaction occurred.
Some transactions represent economic activity and should be included in GDP but are not because the transactions are “invisible.”
© Copyright 2007. Do not distribute or copy without permission. 302
Invisible Transactions That Should Be Included in GDP
Things not included in GDP that should be included
2. Spending on illegal goods and services.
Example:
Buy illegal drugs. This transaction should count as GDP (Consumption) because the drugs were produced in the current year. But, because neither the dealer nor the buyer want the government to know the transaction occurred, the transaction is not counted as part of GDP.
© Copyright 2007. Do not distribute or copy without permission. 303
Invisible Transactions That Should Be Included in GDP
Things not included in GDP that should be included
3. Home labor.
Example:
Mow your lawn. There is no transaction associated with this activity because you do not pay yourself to mow your lawn. However, the mowing of the lawn is the production of a service. That service should be included in GDP but isn’t because there is no transaction and hence no record of a transaction.
© Copyright 2007. Do not distribute or copy without permission. 304
Invisible Transactions That Should Be Included in GDP
Things not included in GDP that should be included
4. Barter.
Example:
Trade lawn mowing for babysitting. There is no transaction associated with this activity because you agree to trade services with your neighbor. However, the mowing of the lawn and the babysitting are the productions of services. Those services should be included in GDP but aren’t because there is no transaction and hence no record of a transaction.
© Copyright 2007. Do not distribute or copy without permission. 305
Income Approach to GDPInterest income less
interest expenseEmployee
compensation
Corporate profits
Rental incom
e
Proprietors income
Personal IncomeIndirect taxes (sales, excise, business
property taxes) and transfers less subsidies
National Income
Depreciation(“capital consumption”)
Gross National Product
Net National Product
Statistical discrepancy
Income to foreigners in the US less income to Americans
abroad
Gross Domestic Product
© Copyright 2007. Do not distribute or copy without permission. 306
Income Approach to GDP
Income Components of GDP (2004)
Employee Compensation
Corporate Profits
Rental Income
Proprietors Income
Net Interest Income
Indirect Taxes
Statistical Discrepancy
Capital Consumption
Net Income from Abroad
© Copyright 2007. Do not distribute or copy without permission. 307
National vs. Domestic Measures
National Income Net Domestic Income at Factor Cost
Net National Product
Net Domestic Product
Gross National Product
Gross Domestic Product
+ Income to foreigners in the US
– Income to Americans abroad
© Copyright 2007. Do not distribute or copy without permission. 308
Nominal vs. Real Measures
A dollar measure is relevant only to the extent that the person reading the measure understands the implied value of the dollar.
Example
In 2006, one gallon of gasoline cost (on average) $2.59, while in 1967, one gallon of gasoline cost $0.26.
These two figures imply that the cost of gasoline has risen 896% over 40 years.
However, in 2006, per-capita disposable income (income after taxes) was $31,240, while in 1967, per-capita disposable income was $2,895.
These two figures imply per-capita disposable income rose 979% over 40 years.
Comparing gasoline to income, we see that the price of gasoline has risen less than per-capita income.
Conclusion: Relative to our incomes, gasoline is cheaper now than it was 40 years ago.
© Copyright 2007. Do not distribute or copy without permission.
Stripping away what economists call, “money illusion,” we see that what ultimately matters to people is how hard they have to work to obtain goods.
The following slides show the number of minutes the average American had to work to afford various goods from the 1920’s to the present.
Note that there are many goods that cannot be represented because the goods did not exist in the past. For example, in 1950 it would have taken an infinite amount of time to earn enough money to buy a DVD player because DVD players did not exist.
Source: Working for Sears Goods, Donald Boudreaux(cafehayek.typepad.com/hayek/2006/01/working_for_sea.html)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
10
20
30
40
50
60
70
80
1920 - 1930 1950 1980 1997
Min
utes
of W
ork
to A
ffor
d
Milk (1 gallon)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
5
10
15
20
25
30
35
1920 - 1930 1950 1980 1997
Min
utes
of W
ork
to A
ffor
d
Gas (1 gallon)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
100
200
300
400
500
600
700
800
900
1920 - 1930 1950 1980 1997
Min
utes
of W
ork
to A
ffor
d
Electricity (1 kWh)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
100
200
300
400
500
600
700
800
900
1920 - 1930 1950 1980 1997
Min
utes
of W
ork
to A
ffor
d
Air Travel (100 miles)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
100
200
300
400
500
600
700
1920 - 1930 1950 1980 1997
Min
utes
of W
ork
to A
ffor
d
Levis Jeans (1 pair)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
The following slides show prices taken from the Sears catalogues for 1975 and 2006. The goods are selected so as to have the same (or very similar) qualities across the two years.
Source: Working for Sears Goods, Donald Boudreaux(cafehayek.typepad.com/hayek/2006/01/working_for_sea.html)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0500
100015002000250030003500400045005000
1975 2006
Min
utes
of W
ork
to A
ffor
d
Freezer
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
200
400
600
800
1000
1200
1400
1975 2006
Min
utes
of W
ork
to A
ffor
d
Garage Door Opener
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
100
200
300
400
500
600
1975 2006
Min
utes
of W
ork
to A
ffor
d
Car Tire
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
100
200
300
400
500
600
700
800
900
1975 2006
Min
utes
of W
ork
to A
ffor
d
Lawn Mower
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
500
1000
1500
2000
2500
3000
3500
1975 2006
Min
utes
of W
ork
to A
ffor
d
Table Saw
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
200
400
600
800
1000
1200
1400
1975 2006
Min
utes
of W
ork
to A
ffor
d
Garbage Disposal
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission.
0
20
40
60
80
100
120
140
160
1975 2006
Min
utes
of W
ork
to A
ffor
d
Interior Latex Paint (1 gallon)
Purchasing Power
© Copyright 2007. Do not distribute or copy without permission. 323
Nominal vs. Real Measures
A nominal dollar measure (or “current dollar measure”) is the actual dollar measure that was taken at a point in time – e.g. the average price of gas in 1967 was $0.26 per gallon in 1967 dollars.
A real dollar measure (or “constant dollar measure”) is the dollar measure taken at a point in time and then adjusted for the overall rate of inflation that has occurred since that point in time – e.g. the average price of gas in 1967 was $2.80 in 2006 dollars.
To compare dollar measures from two different points in time, we first must convert the dollar measures to the same base year. The conversion is achieved using price indices.
© Copyright 2007. Do not distribute or copy without permission. 324
Price Indices
Major types of price indices
CPI (consumer price index) Measures prices of things consumers typically buy
PPI (producer price index) Measures prices of things producers typically buy
IPD (implicit price deflator) Measures prices of all things produced in the economy
Some variations on the price indices
CPI-U CPI for all urban consumers
CPI-W CPI for urban wage earners and clerical workers
C-CPI Chain weighted CPI
© Copyright 2007. Do not distribute or copy without permission. 325
Price Indices
Using Economy.com’s database, find the following consumer price indices for 1974 and 2004.
CPI-U (all items) 1974: 49.32 2004: 188.89
CPI-U (energy) 1974: 38.04 2004: 151.33
CPI-U (medical care) 1974: 42.37 2004: 310.14
CPI-U (transportation) 1974: 45.76 2004: 163.06
On average, the prices of all items purchased by urban consumers in 2004 was 188.89% of the prices in the base year.
On average, the prices of all items purchased by urban consumers in 1974 was 49.32% of the prices in the base year.
© Copyright 2007. Do not distribute or copy without permission. 326
Price Indices
Calculation of a (Simple) Price Index
1. Establish a representative basket of goods and services for the base year.
2. Find the average prices of the goods/services during the base year, and the average prices of the goods/services during the current year.
3. Calculate the total cost of the base-year basket using the base year’s prices and the current year’s prices.
4. The (simple) price index is the ratio of the current year’s total cost to the base year’s total cost (multiplied by 100).
© Copyright 2007. Do not distribute or copy without permission. 327
Price Indices
The average prices of these goods over three years were:
2000 2001 2002Beer $20 $21 $20Car $28,000 $30,000 $31,000House $100,000 $98,000 $102,000
Example
Let 2000 be the base year. In 2000, the average consumer purchased the following quantities of goods/services.
2000Beer 30 unitsCar 0.1 unitsHouse 0.02 units
© Copyright 2007. Do not distribute or copy without permission. 328
Price Indices
Example
Multiplying the quantities of goods in the basket by the prices in each year gives the cost of the base year’s basket in each year.
2000 $5,400 = (30 units)($20) + (0.1 units)($28,000) + (0.02 units)($100,000)
2001 $5,590 = (30 units)($21) + (0.1 units)($30,000) + (0.02 units)($98,000)
2002 $5,740 = (30 units)($20) + (0.1 units)($31,000) + (0.02 units)($102,000)
2000 2001 2002Basket 2000 $5,400 $5,590 $5,740
Prices
© Copyright 2007. Do not distribute or copy without permission. 329
Price Indices
Example
The price index for a year is the total cost of the basket in that year divided by the total cost of the basket in the base year multiplied by 100.
2001
2000
Basket Cost $5,590100 100 103.5
Basket Cost $5,400
2002
2000
Basket Cost $5,740100 100 106.3
Basket Cost $5,400
Basket CostPrice Index for Year using Year as the Base Year 100
Basket CostX
Y
X Y
2000 2001 2002Basket 2000 $5,400 $5,590 $5,740
Prices
© Copyright 2007. Do not distribute or copy without permission. 330
Chain Weighted Price Indices
Calculation of a Chain-Weighted Price Index
1. Establish a representative basket of goods and services for the base year, and a representative basket of goods and services for the current year.
2. Find the average prices of the goods/services during the base year, and the average prices of the goods/services during the current year.
3. Calculate the total cost of the base-year basket and the current-year basket using the base year’s prices.
4. The first simple price index is the ratio of the current year’s total cost to the base year’s total cost.
5. Calculate the total cost of the base-year basket and the current-year basket using the current year’s prices.
6. The second simple price index is the ratio of the current year’s total cost to the base year’s total cost.
7. The chain-weighted price index is the geometric mean of the two simple price indices (multiplied by 100).
© Copyright 2007. Do not distribute or copy without permission. 331
Chain Weighted Price Indices
Chain weighted price indices are an attempt to correct the inflation biases
Over three years, the average consumer purchased the following quantities of goods/services.
2000 2001 2002Beer 30 units 28 units 33 unitsCar 0.10 units 0.09 units 0.08 unitsHouse 0.02 units 0.03 units 0.01 units
The average prices of these goods over three years were:
2000 2001 2002Beer $20 $21 $20Car $28,000 $30,000 $31,000House $100,000 $98,000 $102,000
© Copyright 2007. Do not distribute or copy without permission. 332
2000 2001
2000 $5,400 $5,590
2001 $6,080 $6,228
Prices
Ba
sk
et
2000 2002
2000 $5,400 $5,740
2002 $3,900 $4,160
Prices
Ba
sk
et
2002 Index Calculations2001 Index Calculations
Chain Weighted Price Indices
Let 2000 be the base year
$6,0801.126
$5,400
$6,2281.114
$5,590
2001C-CPI 1.126 1.114 100 112.0
$3,9000.722
$5,400
$4,1600.725
$5,740
2002C-CPI 0.936 0.934 100 72.3
© Copyright 2007. Do not distribute or copy without permission. 333
Inflation
Price indices are expressed in terms of a base year. The index for the base year is defined as 100. Indices for other years give prices relative to the base year.
Example
Suppose 2002 is the base year and the CPI for 2003 is 102.5. This means that, on average, prices in 2003 were 102.5 / 100 = 102.5% times the prices in 2002.
Inflation is calculated as the growth rate in a price index
Total inflation from year to year ln Price Index ln Price Index
ln Price Index ln Price IndexEffective annual inflation from year to year
Y X
Y X
X Y
X YY X
© Copyright 2007. Do not distribute or copy without permission. 334
Inflation
Using the price indices, calculate the following effective annual inflation rates from 1974 to 2004.
ln 188.89 ln 49.324.5%
2004 1974
CPI-U (all items)
CPI-U (energy)
CPI-U (medical care)
CPI-U (transportation)
ln 151.33 ln 38.044.6%
2004 1974
ln 310.14 ln 42.376.6%
2004 1974
ln 163.06 ln 45.764.2%
2004 1974
© Copyright 2007. Do not distribute or copy without permission. 335
Inflation
There does not appear to be much difference between a 4.2% inflation rate (for transportation) and a 4.5% inflation rate (for all items). However, compounded over 30 years, the 0.3% difference can become significant.
ln 188.89 ln 49.32 134% CPI-U (all items)
CPI-U (transportation) ln 163.06 ln 45.76 127%
Using the price indices, calculate the following total inflation rates for all items and for transportation alone.
Total inflation for all items is 7% more than for transportation alone.
© Copyright 2007. Do not distribute or copy without permission. 336
Inflation
On which price index the inflation measure is based alters the definition of inflation.
Example
Inflation calculated from the CPI-U is called “consumer inflation.”
Inflation calculated from the PPI is called “producer inflation.”
Inflation calculated from the IPD is called “(overall) inflation.”
© Copyright 2007. Do not distribute or copy without permission. 337
Inflation
Biases in inflation measures
1. New Goods Bias
Newly invented goods are more expensive, but usually more desirable.
Example: If people stop buying $50 VHS players and start buying $100 DVD players, we will see an increase in inflation measures. However, the extra happiness people get from DVD players exceeds the additional cost of the players (vs. VHS players) – otherwise people would buy the VHS players instead.
Conclusion: Inflation measure can mask the fact that people are happier buying the more expensive product.
© Copyright 2007. Do not distribute or copy without permission. 338
Inflation
Biases in inflation measures
2. Quality Change Bias
Inflation measures imperfectly account for quality changes.
Example: As computers become more powerful, even though their retail prices do not change, for the purpose of price index calculations computers are recorded as being less expensive. The purpose of this is to account for the fact that, one computer today is the equivalent of several computers from five years ago.
Conclusion: Depending on how statisticians interpret quality changes, the official inflation measures can erroneously account for changes in product quality.
© Copyright 2007. Do not distribute or copy without permission. 339
Inflation
September 1977
4 MHz
Disk storage extra
Monitor extra
RAM extra
$1,000 (assembled)
© Copyright 2007. Do not distribute or copy without permission. 340
Inflation
October 1981
32K RAM
1 180K Disk drive
Monitor extra
$1,275
© Copyright 2007. Do not distribute or copy without permission. 341
Inflation
October 1984
64K RAM
Monochrome monitor
2 360K Disk drives
$1,300
© Copyright 2007. Do not distribute or copy without permission. 342
Inflation
March 1986
10 MB HD
Monochrome monitor
256K RAM
360K Disk Drive
Mouse
$1,700
© Copyright 2007. Do not distribute or copy without permission. 343
Inflation
July 1996
75 MHz
510 MB hard drive
Color monitor
8 MB RAM
16 bit audio
$2,900
© Copyright 2007. Do not distribute or copy without permission. 344
Inflation
August 2006
2.8 GHz
250 GB hard drive
19” Flat panel monitor
1 GB RAM
$990
© Copyright 2007. Do not distribute or copy without permission. 345
Inflation
Biases in inflation measures
3. Commodity and Outlet Substitution
As prices change, consumers’ buying habits change.
Example: As the price of shoes rises, people will alter what they buy (fewer shoes and more of other things) and where they buy (buy shoes at discount retailers rather than high-end retailers).
Conclusion: As people change what they buy, the official basket will no longer reflect people’s true purchase decisions. As people change where they buy, official price measures will no longer reflect the prices people are actually paying.
© Copyright 2007. Do not distribute or copy without permission. 346
Inflation
Consequences of erroneously measuring inflation
Wage increases, Social Security benefits, and variable interest rates are tied to official inflation measures.
Many economists believe that the simple CPI-U overstates annual inflation by as much as 1%.
Because Social Security retirement benefits are indexed to inflation, these benefits will increase faster than intended.
© Copyright 2007. Do not distribute or copy without permission. 347
Inflation
Example
In 1970, the law intended (1) that a retiree receive $4,000 annually in Social Security retirement benefits, and (2) that the retirement benefits be increased each year to adjust for inflation.
Suppose the actual annual inflation rate is 2.9%.
By 2004, retirees should receive $10,573 annually. This sum will buy the same quantity of goods and services that $4,000 bought in 1970.
Suppose that the official inflation rate is 3.9%.
By 2004, retirees are actually receiving $14,689 annually. The overstating of inflation has caused retirement benefits to grow in real terms.
Current debate about indexing Social Security benefits to the chain-weighted CPI is an attempt to correct this real growth.
© Copyright 2007. Do not distribute or copy without permission. 348
Effects of Unanticipated Inflation
Anticipated inflation is not a problem because people will incorporate their (correct) expectations about inflation into their decisions.
Unanticipated inflation creates a problem because, had people known what inflation was going to be, they would have made different decisions.
Losers: LendersWhen lenders receive back the monies they loaned, the monies have less purchasing power than the lenders anticipated.
Winners: BorrowersThe dollars that borrowers pay back to lenders have less value (i.e. purchasing power) than the borrowers had anticipated.
Losers: Workers and those on fixed incomesUntil workers’ contracts expire, they cannot negotiate higher wages to compensate for the unexpectedly higher inflation. Similarly, people on fixed incomes have less purchasing power than they anticipated.
Winners: EmployersUntil workers’ contracts expire, the cost of wages to employers is less (in real terms) than the employers anticipated.
© Copyright 2007. Do not distribute or copy without permission. 349
Nominal vs. Real Return
Example
A lender is willing to loan $100,000 for one year in exchange for an annual interest rate of 6%. The 6% rate is called the nominal interest rate and represents the dollar return on the loan Each year, the lender receives ($100,000)(0.06) = $6,000 in interest.
The 6% loan compensates the lender for three costs:
1. Credit risk risk of loan default (e.g. 1%)2. Opportunity risk risk of not investing money in a better opportunity (e.g. 3%)3. Inflation risk risk of purchasing power of loaned money eroding (e.g. 2%)
Nominal return is the dollar return on an investment.Real return is the purchasing power return on an investment.
As with GDP and RGDP, what matters to the investor is the real return, not the nominal return.
© Copyright 2007. Do not distribute or copy without permission. 350
Nominal vs. Real Return
As long as inflation remains at 2%, the lender is exactly compensated for the risks from lending the lender makes “zero economic return.”
At the end of one year, the lender will receive $106,000. Meanwhile, inflation will have reduced the purchasing power of the $106,000 to $106,000 / 1.02 = $103,922. Thus, the lender’s expected nominal return on the loan is $6,000 while the expected real return on the loan is $3,922.
Suppose that, the day after the loan is made, inflation increases to 3%. The lender still receives $106,000 at the end of the year. But, the purchasing power of the $106,000 is only $106,000 / 1.03 = $102,913. Thus, the lender’s nominal return is $106,000, but the real return is $2,913 – or $1,009 less than the lender had expected.
© Copyright 2007. Do not distribute or copy without permission. 351
Nominal vs. Real Return
The real rate of return is given by the formula:
11
1
real interest rate
nominal interest rate
inflation rate
Rr
r
R
Example
At 6% nominal interest and a 2% inflation rate, the real rate of return is:
1 0.061 0.039 3.9%
1 0.02
An increase in inflation to 3% reduces the real rate of return to:
1 0.061 0.029 2.9%
1 0.03
© Copyright 2007. Do not distribute or copy without permission. 352
Nominal vs. Real GDP
Nominal GDP measures productivity in terms of the dollar value generated.
Real GDP measures productivity in terms of the purchasing power generated.
Productivity in 2001
Cars produced1,000,000
Average price per unit$28,000
Contribution to GDP$28.0 billion
Productivity in 2002
Cars produced1,030,000
Average price per unit$30,000
Contribution to GDP$30.9 billion
From 2001 to 2002
Contribution to GDP rose 9.9%
But, production of cars only increased 3.0%
Discrepancy of 6.9% is due to the price of cars rising. We say that GDP rose
9.9%, but RGDP rose 3.0%.
© Copyright 2007. Do not distribute or copy without permission. 353
Nominal vs. Real GDP
We can use price indices to convert GDP to RGDP.
The price index used to convert is called (generically) the GDP deflator. We can use either the IPD (to obtain RGDP) or the chain-weighted IPD (to get chain-weighted RGDP).
GDP for year XReal GDP for year X in terms of year Y prices GDP deflator for year Y
GDP deflator for year X
2001: GDP = $10.0 trillion, IPD = 109.82002: GDP = $10.4 trillion, IPD = 111.3
What is the growth rate in nominal and real GDP from 2001 to 2002?
Growth rate of nominal GDP = ln(10.4) – ln(10.0) = 3.9%
Real GDP for 2002 in 2001 prices = ($10.4 trillion / 111.3) (109.8) = $10.26 trillion
Growth rate of real GDP = ln(10.26) – ln(10.0) = 2.6%
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4000
6000
8000
10000
12000
14000
16000
1991
Q1
1991
Q3
1992
Q1
1992
Q3
1993
Q1
1993
Q3
1994
Q1
1994
Q3
1995
Q1
1995
Q3
1996
Q1
1996
Q3
1997
Q1
1997
Q3
1998
Q1
1998
Q3
1999
Q1
1999
Q3
2000
Q1
2000
Q3
2001
Q1
2001
Q3
2002
Q1
2002
Q3
2003
Q1
2003
Q3
2004
Q1
2004
Q3
2005
Q1
2005
Q3
2006
Q1
2006
Q3
2007
Q1
2007
Q3
2008
Q1
2008
Q3
2009
Q1
354
Business Cycles
GDP (trillions)
RGDP (1991.1 trillions)
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Business Cycles
Business cycles are the natural fluctuations in economic output around “full employment output.”
Full employment RGDP is the maximum sustainable output level.
For short periods, the economy can operate above full employment GDP. This is achieved by, for example, significant numbers of workers working more than 40-hour weeks, factories being run around the clock, etc.
In the long-run, the economy cannot sustain such overproduction because workers and machinery “burnout” – workers move to less stressful jobs, machines breakdown due to lack of maintenance due, in turn, to a lack of down-time.
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4
5
6
7
8
9
10
11
1991
Q1
1991
Q3
1992
Q1
1992
Q3
1993
Q1
1993
Q3
1994
Q1
1994
Q3
1995
Q1
1995
Q3
1996
Q1
1996
Q3
1997
Q1
1997
Q3
1998
Q1
1998
Q3
1999
Q1
1999
Q3
2000
Q1
2000
Q3
2001
Q1
2001
Q3
2002
Q1
2002
Q3
2003
Q1
2003
Q3
2004
Q1
2004
Q3
2005
Q1
2005
Q3
2006
Q1
2006
Q3
2007
Q1
2007
Q3
2008
Q1
2008
Q3
2009
Q1
Trill
ions
356
Business Cycles
2001.1: Dot-com crash
2003.1: Iraq War begins
1996.1: End of Clinton’s first term
2001.3: 9/11 and Enron
1992.1: Start of Clinton’s first term
2005.4: Hurricane Katrina
2008.2: Housing Crash
© Copyright 2007. Do not distribute or copy without permission.
0
2
4
6
8
10
12
1419
47Q
119
48Q
119
49Q
119
50Q
119
51Q
119
52Q
119
53Q
119
54Q
119
55Q
119
56Q
119
57Q
119
58Q
119
59Q
119
60Q
119
61Q
119
62Q
119
63Q
119
64Q
119
65Q
119
66Q
119
67Q
119
68Q
119
69Q
119
70Q
119
71Q
119
72Q
119
73Q
119
74Q
119
75Q
119
76Q
119
77Q
119
78Q
119
79Q
119
80Q
119
81Q
119
82Q
119
83Q
119
84Q
119
85Q
119
86Q
119
87Q
119
88Q
119
89Q
119
90Q
119
91Q
119
92Q
119
93Q
119
94Q
119
95Q
119
96Q
119
97Q
119
98Q
119
99Q
120
00Q
120
01Q
120
02Q
120
03Q
120
04Q
120
05Q
120
06Q
120
07Q
120
08Q
120
09Q
1
Trill
ions
357
Business Cycles
© Copyright 2007. Do not distribute or copy without permission. 358
Employment
Population
Institutionalized Non-institutionalized
MilitaryCivilians
Non-participating Labor Force
EmployedUnemployed
Labor Force
Participation RateCivilians
UnemployedUnemployment Rate
Labor Force
© Copyright 2007. Do not distribute or copy without permission. 359
Employment
0
2
4
6
8
10
12
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
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1972
1973
1974
1975
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1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
Perc
ent o
f Civ
ilian
Lab
or F
orce
Unemployment Rate
© Copyright 2007. Do not distribute or copy without permission. 360
Employment
Unemployment Rates by Educational Attainment
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%19
70
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
MBA BS/BA Total
© Copyright 2007. Do not distribute or copy without permission. 361
Employment
Official unemployment figures understate true unemployment
1. Excludes people who have been unemployed for a long time.People who have been unemployed for 12 months or longer are no longer counted as part of the labor force and are classified as non-employed.
2. Does not account for overqualified workers.People who are overqualified for their positions are not being used to their full capacity. While, in reality, these people are underemployed, they are counted as fully employed.
Example: Someone who qualifies for a $100,000 job but currently holds a $40,000 job should be counted as only 40% employed, but is actually counted as fully employed.
3. Does not account for part-time work.People who work work full-time and people who only work part-time are both considered “employed” to the same extent. In reality, those who are employed part-time are underemployed.
Example: Someone who works 20 hours per week should be counted as 50% employed, but is actually counted as fully employed.
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Employment
Components of Unemployment
1. Cyclical unemployment unemployment because job was temporarily eliminated due to business cycle downturn.
2. Structural unemployment unemployment because job was permanently eliminated due to market changes.
3. Frictional unemployment unemployment due to a job change.
Natural unemployment = Structural unemployment plus Frictional unemployment
Natural unemployment remains in the long-run as “background” unemployment.
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Employment
Relationship between RGDP and Unemployment
Because RGDP measures the production of goods and services, and because labor is required for all production, business cycles and unemployment tend to move in opposite directions.
Frictional unemployment is estimated to be 1% to 2%.
This is the lowest attainable unemployment rate.
Occurs when structural and cyclical unemployment rates are both zero.
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3
4
5
6
7
8
9
10
5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000
Perc
ent U
nem
ploy
ed
RGDP (billions 2005$)
Relationship between RGDP and Unemployment (1991.1 to 2009.2)
364
Employment
2003.2
2001.1: Dot-com crash
2007.3
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Employment
Structural Unemployment and Economic Development
While structural unemployment is the most painful (jobs disappear permanently), it is often necessary for even greater future employment.
Example
Foreign competition in the steel industry causes a permanent loss of manufacturing jobs in the U.S. But, resources shift from manufacturing to other sectors resulting in unforeseen employment gains.
Example
When the automobile replaced the horse, there was tremendous structural unemployment among horse breeders, stables, tack, buggy, wagon manufacturers, and blacksmiths.
What no one at the time could have foreseen was the massive creation of jobs in automobile manufacturing, service, sales, tire manufacturing, gasoline production, distribution, retailing, automotive sound systems production, car detailing, etc.
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Employment
Economic, social, and political factors contribute to cross-country differences in unemployment
Economic factors
Less infrastructure (e.g. roads, electricity, water) in Central America results in higher unemployment because it is too costly for many modern firms to locate there.
Social factors
As a matter of tradition, Japanese employers do not fire or layoff workers. This results is higher unemployment as less productive employees cannot be replaced with more productive employees. The tradition extends to banks continuing to provide credit to firms that are insolvent. As with the workers, this results in an inability of the economy to replace unprofitable firms with profitable firms.
Political factors
German law makes it extremely difficult to fire workers. As a result, firms are reluctant to hire workers and so the unemployment rate in Germany is consistently above 10%.
© Copyright 2007. Do not distribute or copy without permission. 367
Employment
Unemployment Rates (2004)
0%
5%
10%
15%
20%
25%U
nite
dK
ingd
om
Uni
ted
Sta
tes
Can
ada
Chi
le
Ital
y
Eur
opea
nU
nion
Fra
nce
Spa
in
Ger
man
y
Bra
zil
Mex
ico
Ven
ezue
la
Chi
na
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Aggregate Demand and Aggregate Supply
As with microeconomic analysis, we can summarize the behaviors of producers and consumers with demand and supply.
The behavior of all consumers as a whole is summarized by aggregate demand.
The behavior of all producers as a whole is summarized by aggregate supply.
The equilibrium formed by aggregate demand and aggregate supply is called the macroequilibrium.
© Copyright 2007. Do not distribute or copy without permission. 369
Aggregate DemandPri
ce
Ind
ex
RGDP
AD
Typical Aggregate Demand Shocks
1. Change in consumers’ spending that is independent of price changes.
2. Change in investment spending that is independent of price changes.
3. Change in government spending that is independent of price changes.
4. Change in net export spending that is independent of (domestic) price changes.
AD’
Increase in AD
AD’’
Decrease in AD
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Aggregate DemandPri
ce
Ind
ex
RGDP
AD
Aggregate demand is the relationship between the average price level and aggregate expenditures.
Aggregate expenditures is the amount of purchasing power the economy spends at a given price level.
Average price level
Aggregate Expenditure
s
AD in macro is analogous to D in micro.
AE in macro is analogous to Qd in
micro.
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Aggregate SupplyPri
ce
Ind
ex
RGDP
Short-Run Aggregate Supply Shock
1. Change in resource prices.
Long-Run Aggregate Supply Shock
1. Change in quantity of resources.
2. Change in technology.
SRAS
Full employment RGDP
LRAS
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Aggregate SupplyPri
ce
Ind
ex
RGDP
Decrease in SRAS
Pri
ce
Ind
ex
RGDP
Increase in SRAS
A change in resource prices without a change in the quantity of resources impacts SRAS, but does not impact LRAS because the maximum attainable production level (i.e. full employment RGDP) has not changed.
SRAS’
SRAS
SRAS
SRAS’
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Aggregate SupplyPri
ce
Ind
ex
Increase in full employment RGDP
A change in the quantity of resources impacts LRAS because the maximum attainable production level (i.e. full employment RGDP) has changed.
Pri
ce
Ind
ex
LRAS
LRAS’
Decrease in full employment RGDP
LRAS’
LRAS
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Aggegate SupplyPri
ce
Ind
ex
An increase in LRAS and an increase in the PPF are the same thing. The PPF shows how the increase in production can be broken down into two types of goods. The LRAS shows production of all goods combined into a single measure.
Durables
Non-
dura
ble
s
Increase in PPF
LRAS
LRAS’
© Copyright 2007. Do not distribute or copy without permission. 375
Aggegate SupplyPri
ce
Ind
ex
An increase in SRAS is caused by a reduction in the prices of factors. This will cause the economy to shift production toward products that intensively use factors. Because the quantity of factors has not changed, the PPF does not change.
Factor non-intensive products
Fact
or
inte
nsi
ve
pro
duct
s
Movement along the PPF
SRAS
SRAS’
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Aggregate SupplyPri
ce
Ind
ex
RGDP
SR aggregate supply is the relationship between the average price level and aggregate output in the short run.
Aggregate output is the amount of real output the economy generates at a given price level.
Average price level
Aggregate output = RGDP
AS in macro is analogous to S in micro.
RGDP in macro is analogous to Qs in
micro.
SRAS
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Short Run MacroequilibriumPri
ce
Ind
ex
RGDP
Short-Run Equilibrium
Equilibrium Point A is a short-run macroequilibrium because (a) at Point A, aggregate expenditures equal aggregate output, and (b) at Point A, aggregate output does not equal full employment output.SRA
S
AD
112
$8 t.
A
LRAS
Full employment RGDP
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Long Run MacroequilibriumPri
ce
Ind
ex
RGDP
Long-Run Equilibrium
Equilibrium Point A is a long-run macroequilibrium because (a) at Point A, aggregate expenditures equal aggregate output, and (b) at Point A, aggregate output equals full employment output.
124
$8.2 t.
AD
A
LRAS SRA
S
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Short Run to Long Run TransitionPri
ce
Ind
ex
RGDP
1. At Point A, equilibrium output is less than full employment output. This means that there is unemployment.
AD
112
$8 t.
A
4. Point B is a long-run equilibrium because (a) aggregate expenditures equal aggregate output, and (b) aggregate output equals full employment output.
SRAS
LRAS
2. In the long run, competition among the unemployed leads to a reduction in the prices of factors. This results in an increase in SRAS.
SRAS’3. The increase in SRAS causes a
reduction in the average price level and an increase in output. The economy moves to Point B.
110
$8.2 t.
B
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Macroeconomic ShocksPri
ce
Ind
ex
RGDP
1. The economy starts at long-run equilibrium Point A.
124
$8.2 t.
AD
A
2. A decrease in consumer confidence causes consumption to fall. This is a negative shock to AD AD decreases.
AD’
3. The economy moves to equilibrium Point B. SR impact of shock: Prices fall, RGDP falls.
B118
$8.1 t.
4. Because there is unemployment at Point B, the equilibrium is only a short-run equilibrium.
6. The economy moves to equilibrium Point C. LR impact of shock: Prices fall, RGDP unchanged.
C116
LRAS
SRAS
5. In the long run, unemployment puts downward pressure on the prices of factors causing SRAS to increase.
SRAS’
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Macroeconomic ShocksPri
ce
Ind
ex
RGDP
1. The economy starts at long-run equilibrium Point A.
115
$8.2 t.
AD
A
3. The economy moves to equilibrium Point B. SR impact of shock: Prices rise, RGDP rises.
B118
$8.3 t.
4. Because there is over employment at Point B, the equilibrium is only a short-run equilibrium.
6. The economy moves to equilibrium Point C. LR impact of shock: Prices rise, RGDP unchanged.
C120
LRAS
SRAS
2. The government increases its spending. This is a positive shock to AD AD increases.
AD’
5. In the long run, over employment puts upward pressure on the prices of factors causing SRAS to decrease.
SRAS’
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Macroeconomic Shocks: Creation of the InternetPri
ce
Ind
ex
RGDP
1. In 1997, real GDP was $8.7 trillion and the IPD was 109.0 (Point A).
$8.7 t.
109A
LRAS
AD
SRAS
2. The creation and growth of the Internet represents a new resource. LRAS increases over the period 1997 through 2002.
LRAS’
3. Increase in quantity of resources causes a reduction in the prices of resources. SRAS increases.
SRAS’
$10.1 t.
B
4. Economy moves to Point B. Prices are lower and RGDP is higher.
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Macroeconomic Shocks: Creation of the InternetPri
ce
Ind
ex
RGDP
$8.7 t.
109
$10.1 t.
A
LRAS
AD
What really happened
From 1997 to 2002, AD was increasing also, so the economy moved from Point A to Point C.
SRAS
AD’
C
As a result, by 2002, the IPD had risen to 116 instead of falling.
116
LRAS’
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Macroeconomic Shocks: Creation of the InternetPri
ce
Ind
ex
RGDP
$8.7 t.
109A
LRAS
AD
SRAS
However, if the Internet had not been created, the same increase in AD would have increased the prices of resources and pushed the IPD higher than 116 to Point D.
AD’
SRAS’
D
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Macroeconomic Shocks: War Disrupts Oil MarketsPri
ce
Ind
ex
RGDP
1. In 2002, real GDP was $10.1 trillion and the IPD was 116 (Point A).
$10.1 t.
116A
LRAS
AD
SRAS
2. The Iraq War causes a disruption in oil markets resulting in an increase in the price of oil. The market does not react as if the quantity of oil available has declined because the market believes the disruption to be temporary.
3. Increase in the price of oil causes the SRAS to decrease.SRAS
’
B
4. Economy moves to Point B (for the short run). RGDP declines and prices rise.
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Macroeconomic Shocks: War Disrupts Oil MarketsPri
ce
Ind
ex
RGDP
5. In the long run, oil production will return to normal and oil prices will fall.
$10.1 t.
116A
LRAS
AD
SRAS
7. In the long run, RGDP returns to full employment and prices return to their original level.SRAS
’
B
6. This will result in an increase in the SRAS to its original level. The economy will return to Point A.
© Copyright 2007. Do not distribute or copy without permission. 387
Macroeconomic Shocks: War Disrupts Oil MarketsPri
ce
Ind
ex
RGDP
What really happened
At the same time that oil markets were disrupted, the Federal government increased spending to pay for the war and Homeland Security.
$10.1 t.
116A
LRAS
AD
SRAS
1. Increase in the price of oil causes the SRAS to decrease.SRAS
’2. Almost simultaneously, AD
increases due to the increase in government spending.
AD’
C
3. Economy moves to Point C. Prices rise, but RGDP remains at full employment.
© Copyright 2007. Do not distribute or copy without permission. 388
Macroeconomic Shocks: Housing Bubble BurstsPri
ce
Ind
ex
RGDP
1. In 2008, real GDP was $13 trillion and the IPD was 108 (Point A).
$13 t.
108A
LRAS
AD
SRAS
B
2. When the housing bubble burst, AD fell because people perceived themselves to be less wealthy (decline in consumption), and banks cut back on lending (decline in investment). This would have moved the economy to point B.
AD’
3. Over time, unemployment would have caused prices to fall and the economy would have moved to point C.
SRAS’
C
© Copyright 2007. Do not distribute or copy without permission. 389
Macroeconomic Shocks: Housing Bubble BurstsPri
ce
Ind
ex
RGDP
What really happened
$13 t.
108A
LRAS
AD
SRAS
B
2. When the housing bubble burst, AD fell because people perceived themselves to be less wealthy (decline in consumption), and banks cut back on lending (decline in investment). This would have moved the economy to point B.
AD’
3. The government passed legislation to dramatically increase spending in an attempt to increase AD.
SRAS’
C
4. Unemployment causes prices to drop and the economy begins to heal itself. Then, as increased government spending kicks in, we will find the economy being pushed above full employment RGDP (point C).
© Copyright 2007. Do not distribute or copy without permission. 390
Deflationary and Inflationary GapsPri
ce
Ind
ex
RGDP
When the short run equilibrium output is less than full employment output, we say that there exists a deflationary gap. In the long run, SRAS will increase causing the economy to achieve full employment along with a fall in the average price level.
When the short run equilibrium output is greater than full employment output, we say that there exists an inflationary gap. In the long run, SRAS will decrease causing the economy to achieve full employment along with an increase in the average price level.
LRAS
AD
SRAS
Pri
ce
Ind
ex
RGDP
LRAS
AD
SRAS
Deflationary gap
Inflationary gap
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Expenditure Multiplier
From the expenditures approach to calculating GDP, we have:
Y C I G X M
Let consumption be comprised of two components: autonomous and induced consumption.
0 dC C bY
Autonomous consumption
Induced consumption
Autonomous consumption An amount of money that (on average) consumers will spend regardless of their incomes.
Induced consumption An amount of money that (on average) consumers will spend as a function of their disposable incomes.
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Expenditure Multiplier
Disposable income is income net of income taxes.
1dY Y t T R
t = marginal tax rate (e.g. 20% of income)
T = flat tax (e.g. $5,000)
R = government transfers (e.g. $2,000)
where b is the marginal propensity to consume (MPC).
Induced consumption is:
1dbY b Y t T R
MPC is the amount of money out of every $1 of disposable income that consumers will spend on consumption.
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Expenditure Multiplier
Example
Suppose C0 = $12,000, Y = $50,000, t = 0.2, T = $1,000, R = $0, and b =
0.8.
Disposable Income: 1 $50,000 1 0.2 $1,000 $39,000dY Y t T R
0Consumption: $12,000 0.8 $39,000 $43,200dC C bY
Savings: $39,000 $43,200 $4,200dS Y C
In this example, households breakeven at (on average) an income level of $76,250.
Disposable Income: 1 $76,250 1 0.2 $1,000 $60,000dY Y t T R
0Consumption: $12,000 0.8 $60,000 $60,000dC C bY
Savings: $60,000 $60,000 $0dS Y C
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Expenditure Multiplier
Similarly, let imports be comprised of autonomous and induced components.
0 dM M mY
Autonomous imports
Induced imports
Note that savings (S ) is Y – C, not Y – C – M, because consumption includes purchases of both domestic products and imports. Because imports should not be counted toward the domestic country’s GDP, we subtract M from Y in the GDP equation.
© Copyright 2007. Do not distribute or copy without permission. 395
Expenditure Multiplier
Autonomous ExpendituresI InvestmentG Government spending
C0 Autonomous consumption
M0 Autonomous importsX Exports
Induced Expenditures
bYd Induced consumption
mYd Induced imports
Parametersb Marginal propensity to consumem Marginal propensity to importt Marginal tax rateT Flat taxR Transfers
Note that exports (X ) do not include an induced component. While it is the case that spending on exports is a function of income, the spending is a function of foreign consumers’ incomes. As such exports are autonomous with respect to domestic income.
© Copyright 2007. Do not distribute or copy without permission. 396
Expenditure Multiplier
0
0
(1 )
d
d
d
Y C I G X M
C C bY
M M mY
Y Y t T R
We now have a set of equations that describe spending.
We can solve these equations for Y to obtain GDP as a function of autonomous spending:
0 0
1
1 (1 )Y C I G X M b m T R
b m t
© Copyright 2007. Do not distribute or copy without permission. 397
Expenditure Multiplier
Retrieve nominal quarterly data on consumption and disposable personal income from Economy.com’s database (1959.1 to 2005.1). Via OLS, find estimates for autonomous consumption and the marginal propensity to consume and construct the estimated consumption equation.
1. State the model we are attempting to estimate.
2. Run the regression.
67.56 0.93 dC Y
0 dC C bY
3. State the estimated regression model.
CoefficientsIntercept -67.55519062Disposable Income 0.931256974
© Copyright 2007. Do not distribute or copy without permission. 398
Expenditure Multiplier
Retrieve nominal quarterly data on imports and disposable personal income from Economy.com’s database (1959.1 to 2005.1). Via OLS, find estimates for autonomous imports and the marginal propensity to import and construct the estimated imports equation.
1. State the model we are attempting to estimate.
104.98 0.19 dM Y
0 dM M mY
2. Run the regression.
3. State the estimated regression model.
CoefficientsIntercept -104.9787082Disposable Income 0.192439729
© Copyright 2007. Do not distribute or copy without permission. 399
Expenditure Multiplier
Retrieve nominal quarterly data on GDP and disposable personal income from Economy.com’s database (1959.1 to 2005.1). Via OLS, find estimates for flat taxes less transfers and the marginal tax rate and construct the estimated disposable income equation.
1. State the model we are attempting to estimate.
0.75 56.33dY Y
1dY Y t T R
2. Run the regression.
3. State the estimated regression model.
1 0.75 0.25t t 56.33 56.33T R T R
CoefficientsIntercept -56.33440016GDP 0.74648681
© Copyright 2007. Do not distribute or copy without permission. 400
Expenditure Multiplier
Retrieve nominal quarterly data on the remaining autonomous expenditures for 2005.1.
Remaining Autonomous Expenditures
I InvestmentG Government spendingX Exports
$2,130.7 billion$2,316.5 billion$1,262.4 billion
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Expenditure Multiplier
Combine these figures into a single equation that expresses GDP as a function of autonomous spending.
Autonomous Expenditures ParametersI $2,130.7 b. b 0.93G $2,316.5 b. m 0.19
C0 –$67.56 b. t 0.25
M0 –$104.98 b. T – R $56.33 b.X $1,262.4 b.
0 0
1
1 (1 )Y C I G X M b m T R
b m t
167.56 2130.7 2316.5 1262.4 104.98 0.93 0.19 56.33
1 0.93 0.19 (1 0.25)Y
2.25 5683.93 $12,773 billionY Estimate of GDP as of 2005.1
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Expenditure Multiplier
We can use the multipliers to estimate the impact of a change in autonomous spending on GDP.
0 0For , , , , or
1
1 (1 )
For
1 (1 )
A C I G X M
Y Ab m t
A T R
b mY A
b m t
We call the fraction the expenditures multiplier and
the flat tax and transfer multiplier
1
1 (1 )b m t
1 (1 )
b m
b m t
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Fiscal Policy
Example
Suppose the expenditures multiplier is 2.21. What is the impact on GDP of the government increasing spending by $200 billion?
0 0For , , , , or
2.21
200 2.21 200 $442 billion
A C I G X M
Y A
A Y
Suppose the flat tax and transfers multiplier is expenditures multiplier is –2.52. What is the impact on GDP of the government reducing transfer payments by $200 billion?
For
2.52
200 200
200 2.52 200 $504 billion
A T R
Y A
R A T R
A Y
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Fiscal Policy
Republicans have proposed cutting marginal tax rates from 25% to 23% and leaving government spending unchanged. Democrats have proposed increasing marginal tax rates from 25% to 32% and increasing government spending by $1 trillion.
Using current expenditure values and the previously derived parameter estimates, estimate the impact of each plan on GDP.
Current Republican Plan Democrat Plan
I 2130.7 2130.7 2130.7G 2316.5 2316.5 3316.5C0 -67.6 -67.6 -67.6M0 -105.0 -105.0 -105.0X 1262.4 1262.4 1262.4
b 0.93 0.93 0.93m 0.19 0.19 0.19t 0.25 0.23 0.32T-R 56.3 56.3 56.3
multiplier 2.25 2.32 2.01autonomous expenditures 5683.9 5683.9 6683.9
Predicted GDP 12773 13212 13454
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Fiscal Policy
Government surplus Tax Revenues Government Spending
T R tY G
Estimate the impact on the total government surplus of the two plans.
Current Republican Plan Democrat Plan
I 2130.7 2130.7 2130.7G 2316.5 2316.5 3316.5C0 -67.6 -67.6 -67.6M0 -105.0 -105.0 -105.0X 1262.4 1262.4 1262.4
b 0.93 0.93 0.93m 0.19 0.19 0.19t 0.25 0.23 0.32T-R 56.3 56.3 56.3
multiplier 2.25 2.32 2.01autonomous expenditures 5683.9 5683.9 6683.9
Predicted GDP 12773 13212 13454
Tax Revenue 3249.5 3095.2 4361.6Spending 2316.5 2316.5 3316.5
Surplus (Deficit) -933.0 -778.7 -1045.1
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Fiscal PolicyPri
ce
Ind
ex
RGDP
1. The economy starts at short run equilibrium Point A. The autonomous expenditures multiplier is 2.5. There is a $200 billion deflationary gap.
$7.6 t.
A
LRAS
AD
SRAS
2. In an attempt to close the deflationary gap, the government increases spending by $80 billion. This will increase GDP by (2.5)($80 billion) = $200 billion.
3. The increase in government spending is a shock to AD. AD increases by $200 billion.
AD’
$200 b. shift
$7.8 t.
100.0
5. If prices had remained constant, RGDP would have increased by $200 billion to $7.8 t. Instead, prices rise by 1.3%.
101.3
6. GDP increased by (2.5)($80 b.) = $200 billion to $7.8 trillion.
RGDP only increased by $100 billion to $7.7 trillion.
$7.7 t. = ($7.8 t.)(100.0)/(101.3)
$7.7 t.
B 4. Economy moves to Point B.
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Economic Policy
Any organized attempt to influence the economy is called economic policy.
There are three major types of economic policy:
1. Fiscal policy Any attempt by the Federal government to influence either inflation or RGDP. Government enacts fiscal policy via alterations in government spending and taxation.
2. Monetary policy Any attempt by the Central Bank to influence either inflation or RGDP. Central Bank enacts monetary policy via alterations in the money supply.
3. Trade policy Any attempt by either the Federal government or the Central Bank to influence trade. Trade policy is enacted via alterations in tariffs, the exchange rate, and the money supply.
In the United States, the fiscal policy is almost always aimed at influencing RGDP, monetary policy is usually (though not always) aimed at influencing inflation. Trade policy is almost always conducted by the Federal government.
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Economic Policy
Government Spending (including transfers) as Fraction of GDP
15%
16%
17%
18%
19%
20%
21%19
83Q
119
84Q
219
85Q
319
86Q
419
88Q
119
89Q
219
90Q
319
91Q
419
93Q
119
94Q
219
95Q
319
96Q
419
98Q
119
99Q
220
00Q
320
01Q
420
03Q
120
04Q
220
05Q
320
06Q
420
08Q
120
09Q
2
© Copyright 2007. Do not distribute or copy without permission.
0%
5%
10%
15%
20%
25%19
54
1957
1960
1963
1966
1969
1972
1975
1978
1981
1984
1987
1990
1993
1996
1999
2002
2005
2008
409
Economic Policy
Federal Government Revenue (all sources) as Fraction of GDP
© Copyright 2007. Do not distribute or copy without permission.
$0
$500
$1,000
$1,500
$2,000
$2,500
$3,00019
54
1957
1960
1963
1966
1969
1972
1975
1978
1981
1984
1987
1990
1993
1996
1999
2002
2005
2008
410
Economic Policy
Federal Government Revenue (all sources, billions 2008$)
© Copyright 2007. Do not distribute or copy without permission. 411
Policy LagsPolicy lags are time intervals that pass between the need for economic policy and the realization of the effects of economic policy.
Major types of policy lags:
1. Recognition lag The time interval between when economic policy is needed and the realization that economic policy is needed. Often, several months will pass between a turning point in the business cycle and the realization that a turning point has been reached.
2. Decision lag The time interval between the realization that economic policy is needed and the determination of the details of what policy to enact.
The Federal Reserve’s decision lag tends to be extremely short because (a) the Board of Governors is small (7 people), (b) the BOG is comprised entirely of professional economists, bankers, and accountants, and (c) the BOG is insulated from political pressures. The Federal government’s decision lag tends to be extremely long for the opposite reasons.
3. Implementation lag The time interval between the decision as to what policy to employ and the full impact of the policy on the economy. Implementation lags can be moderately to extremely long.
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Policy LagsBecause the economy is self-correcting (i.e. the economy naturally returns to full employment on its own), and because policy lags cannot be avoided, most economic policy is destabilizing.Example
The economy starts into recession in January. It takes until March before people become aware that the economy is in recession. The Federal government debates enacting tax cuts to help bolster the economy. It takes until June for the Congress and President to agree on a course of action. Tax cuts are enacted in June, but the full impact of the tax cuts doesn’t filter through the economy until October. However, by October, the economy had naturally turned around on its own.
Result: The expansionary policy reinforces the expansion that is naturally taking place resulting in the economy overshooting full employment and so generating inflation.
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Attributes of Money
Any object that fulfills the following three criteria is considered money.
1. Medium of exchange
Object is readily accepted in exchange for goods and services.
2. Store of value
Object maintains its value over time.
3. Standard of value
Values of other objects are measured relative to this object.
Notice that it is not necessary for the object to have an inherent value (i.e. value beyond being a medium of exchange).
Objects used for money that have inherent value are called commodity money (e.g. gold coins).
Objects used for money that have no inherent value are called fiat money (e.g. paper bills).
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Benefits of Money
An economy based on money (rather than barter) achieves greater productivity.
1. Money eliminates double incidence of wants.
Without money, every exchange must involve two transactions Suppose the a person seeks to buy product A and has product B to offer in exchange. For exchange to occur, the person must find someone who (1) seeks to buy product B, and (2) has product A to offer in exchange. In every exchange, each party is both a buyer and a seller.
With money, every exchange involves one transaction only A person seeks to buy product A. The person must find someone who offers product A. In the exchange, one person is a buyer only and the other person is a seller only.
2. Money makes intertemporal substitution of consumption possible.
Without money, people must consume products as they are produced because most products will degrade over time.
With money, people can forego current consumption for future consumption via saving, and can forego future consumption for current consumption via borrowing.
3. Money makes investment possible.
Because money allows for intertemporal substitution of purchasing power, people can borrow from their future selves to invest (in human or physical capital) so as to create greater future income.
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Benefits of MoneyExample
A person requires $90,000 to pay for a college education. Without the education, the person earns $30,000 annually. With the education, the person earns $60,000 annually. The person incurs $15,000 in annual living expenses regardless of his education.Option #1: Save to pay for college
Ages 18 – 27 Earn $30,000 per year and save $15,000 per year
Ages 28 – 31 Attend college at a total cost of $150,000
Ages 32 – 65 Earn $60,000 per year
Lifetime earnings = $2,340,000
Option #2: Borrow $150,000 to pay for college and living expenses
Ages 18 – 21 Attend college at a total cost of $150,000
Ages 22 – 31 Earn $60,000 per year and pay back $15,000 per year
Ages 32 – 65 Earn $60,000 per year
Lifetime earnings = $2,640,000
Borrowing to invest in education increased lifetime earnings by $300,000
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Federal Reserve
The entity responsible for maintaining a country’s money supply is the central bank. In the U.S., the central bank is called the Federal Reserve (or the “Fed”).
The Fed prints money, establishes rules under which banks operate, and aids in the check clearing process.
The Fed is comprised of 12 District Banks. Monetary policy decisions are made by the Board of Governors – a panel of seven people appointed to 14-year terms.
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Liquidity Classifications
Financial assets are classified according to liquidity.
Liquidity is the ability to turn an asset into cash quickly and without incurring a loss.
M0 Notes + coins
MB M0 + bank deposits at the Federal Reserve
M1 Notes + coins + checkable deposits + travelers checks + other deposits against which checks can be written without penalty.
M2 M1 + savings deposits + retail money market mutual fund deposits + small certificates of deposit (CD’s) (small = under $100,000)
M3 M2 + institutional money market fund deposits + large certificates of deposit (large = over $100,000) + repurchase agreements (short term loan collateralized, typically, by an M2 asset) + Eurodollars (dollar denominated deposits in foreign branches of U.S. banks).
M4 M3 + U.S. government savings bonds + short-term treasury securities + commercial paper + bankers acceptance.
Financial assets = M4 + other publicly traded financial assets + privately traded financial assets
More
liqu
idLe
ss liqu
id
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Liquidity Classifications
Assets
Financial Assets
L
M3M2
M1MS
Monetary Base
M4
MBM0
© Copyright 2007. Do not distribute or copy without permission. 419
Economic Policy
Total Reserves Divided by RGDP
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.00819
59Q
119
61Q
119
63Q
119
65Q
119
67Q
119
69Q
119
71Q
119
73Q
119
75Q
119
77Q
119
79Q
119
81Q
119
83Q
119
85Q
119
87Q
119
89Q
119
91Q
119
93Q
119
95Q
119
97Q
119
99Q
120
01Q
120
03Q
120
05Q
120
07Q
1
© Copyright 2007. Do not distribute or copy without permission.
0
0.01
0.02
0.03
0.04
0.05
0.06
0.0719
59Q
119
61Q
119
63Q
119
65Q
119
67Q
119
69Q
119
71Q
119
73Q
119
75Q
119
77Q
119
79Q
119
81Q
119
83Q
119
85Q
119
87Q
119
89Q
119
91Q
119
93Q
119
95Q
119
97Q
119
99Q
120
01Q
120
03Q
120
05Q
120
07Q
120
09Q
1
420
Economic Policy
Total Reserves Divided by RGDP
© Copyright 2007. Do not distribute or copy without permission.
0
20
40
60
80
100
120
140
160
180
20019
59Q
119
61Q
219
63Q
319
65Q
419
68Q
119
70Q
219
72Q
319
74Q
419
77Q
119
79Q
219
81Q
319
83Q
419
86Q
119
88Q
219
90Q
319
92Q
419
95Q
119
97Q
219
99Q
320
01Q
420
04Q
120
06Q
220
08Q
3
421
Economic Policy
M2 Divided by Total Reserves
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Financial Intermediaries
Transfer of money across time is facilitated by financial markets.
Financial disintermediation ultimate lender lends directly to ultimate borrower (e.g. an individual buys a corporate bond).
Pro: Individual gains a higher rate of return.
Con: Individual is exposed to default risk.
Financial intermediation ultimate lender lends indirectly to ultimate borrower via a financial intermediary (e.g. an individual puts money in a bank; the bank buys a corporate bond).
Pro: Individual is not exposed to default risk.
Con: Individual earns a lower rate of return.
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Financial Intermediaries
Major types of financial intermediaries
Commercial banks
Savings and Loans
Credit Unions
Money market mutual funds
Insurance companies
Finance companies
© Copyright 2007. Do not distribute or copy without permission. 424
Banking Crisis of 2008
MORTGAGE A
Payment$800
Life 30 yrs
Risk 5%
MORTGAGE B
Payment$1,000
Life 30 yrs
Risk 1%
MORTGAGE C
Payment$1,200
Life 30 yrs
Risk 4%
MORTGAGE D
Payment$1,500
Life 30 yrs
Risk 10%
MORTGAGE E
Payment$300
Life 30 yrs
Risk 15%
MORTGAGE F
Payment$1,200
Life 30 yrs
Risk 20%
MBS #1
Payment$3,000
Life 30 yrs
Risk 3.3%
MBS #2
Payment$3,000
Life 30 yrs
Risk 14.5%
© Copyright 2007. Do not distribute or copy without permission. 425
Fractional Reserves
When an individual deposits cash into a bank, the bank creates a deposit account in the person’s name that contains the value of the cash deposited. The deposit account is a liability to the bank. The corresponding asset is the cash the bank received.
Joe Smith’s Deposit Account $100Cash $100
When a bank loans money to an individual, the bank creates a deposit account in the person’s name that contains the value of the loan. The deposit account is a liability to the bank. The corresponding asset is the loan.
Susan Jones’ Deposit Account $100Loan to Susan Jones $100
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Fractional Reserves
When a bank loans money, the bank does not give the borrower cash, but creates a deposit account against which the borrower can write checks. As a result, it is possible for a bank to give loans without having cash to “backup” the loans.
Example
Suppose Smith deposits $100 in the bank, and then the bank gives a loan to Jones for $300. The bank’s accounts would look like the following.
Joe Smith’s Deposit Account $100
Susan Jones’ Deposit Account $300
Cash $100
Loan to Susan Jones $300
Notice that, together, Smith and Jones can write checks for a total of $400 despite the fact that the bank only has $100 cash.
We call this fractional reserves because the bank is required to only maintain a fraction of its deposits in the form of cash.
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Fractional Reserve Accounting
Deposits (D)The total value held by the bank’s customers in accounts at the bank. Deposits include checking deposits, savings deposits, loan deposits, certificates of deposit, etc.
Total Reserves (TR)The value of cash on hand plus the value of the bank’s deposits at the Federal Reserve.
Reserve Requirement Ratio (rrr)The percentage of deposits held by the bank’s customers for which the bank is required to hold reserves. The reserve requirement ratio is set by the Fed.
Required Reserves (RR)The minimum amount of reserves the bank is required to have.RR = (D)(rrr)
Excess Reserves (ER)An additional amount of reserves the bank has beyond what is required by law.ER = TR – RR
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Fractional Reserve Accounting
Example
Using the bank’s accounts below and assuming the reserve requirement ratio is 4%, calculate the bank’s TR, RR, and ER.
Customer Deposit Accounts$25,100,000
Cash $100,000
Deposits at the Fed $1,300,000
Loans $23,000,000
Treasury Bills $700,000
Customer Deposits = D = $25,100,000
TR = Vault cash + Deposits at the Fed = $100,000 + $1,300,000 = $1,400,000
RR = (D)(rrr) = ($25,100,000)(0.04) = $1,004,000
ER = TR – RR = $1,400,000 – $1,004,000 = $396,000Assuming that this is the only bank in the economy and the only person holding cash is Smith (who keeps $10,000 under his mattress), what is the money supply?$25,110,000
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Fractional Reserve Accounting
Example
Continuing with the previous question, suppose Smith deposits his $10,000 cash in the bank. What is the impact on the bank’s accounts?
Customer Deposit Accounts$25,100,000
Smith Deposit Account $10,000
Cash $110,000
Deposits at the Fed $1,300,000
Loans $23,000,000
Treasury Bills $700,000
Calculate the bank’s TR, RR, and ER, and the money supply.
Customer Deposits = D = $25,110,000
TR = Vault cash + Deposits at the Fed = $110,000 + $1,300,000 = $1,410,000
RR = (D)(rrr) = ($25,110,000)(0.04) = $1,004,400
ER = TR – RR = $1,410,000 – $1,004,400 = $405,600
MS = $25,110,000
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Fractional Reserve Accounting
Example
Continuing with the previous question, suppose the bank gives Jones a home loan for $275,000. Prior to Jones spending the money on the home, what is the impact on the bank’s accounts?
Customer Deposit Accounts$25,100,000
Smith Deposit Account $10,000
Jones Deposit Account $275,000
Cash $110,000
Deposits at the Fed $1,300,000
Loans $23,275,000
Treasury Bills $700,000
Calculate the bank’s TR, RR, and ER, and the money supply.
Customer Deposits = D = $25,385,000
TR = Vault cash + Deposits at the Fed = $110,000 + $1,300,000 = $1,410,000
RR = (D)(rrr) = ($25,385,000)(0.04) = $1,015,400
ER = TR – RR = $1,410,000 – $1,015,400 = $394,600
MS = $25,385,000
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Fractional Reserve Accounting
Example
Continuing with the previous question, what is the impact on the bank’s accounts when ABC Construction deposits Jones’ check for $275,000 for building her house?
Customer Deposit Accounts$25,100,000
Smith Deposit Account $10,000
Jones Deposit Account $0
ABC Const. Deposit Account$275,000
Cash $110,000
Deposits at the Fed $1,300,000
Loans $23,275,000
Treasury Bills $700,000
Calculate the bank’s TR, RR, and ER, and the money supply.
Customer Deposits = D = $25,385,000
TR = Vault cash + Deposits at the Fed = $110,000 + $1,300,000 = $1,410,000
RR = (D)(rrr) = ($25,385,000)(0.04) = $1,015,400
ER = TR – RR = $1,410,000 – $1,015,400 = $394,600
MS = $25,385,000
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Money Creation
Notice that, when Smith deposited the $10,000 cash in the bank, the money supply did not change.
All that happened was that the components of the money supply shifted $10,000 cash in Smith’s hands became Smith’s $10,000 checking deposits. Remember: The cash is the bank’s hands does not count toward the money supply.
Notice that, when Jones obtained the loan for the house, the money supply increased.
When the bank gave Jones a loan, the bank created a loan deposit account for Jones. This deposit account counts toward the money supply just like a checking account because Jones can write checks on the account to pay for her house.
Yes, Jones owes the bank $275,000, but this does not change the fact that Jones now can spend up to $275,000 on a house the increased ability to spend is the cause of the increase in the money supply.
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Money Creation
Banks create money when they create loans. Because the bank is required to maintain some minimum quantity of reserves, there is a limit to how much money a bank can create.
Smith Deposit Account $100Cash $100
Start with an economy that has a single bank with $100 in the vault. There is no other cash and the reserve requirement ratio is 10%.
The bank’s reserve calculations and the money supply are
Customer Deposits = D = $100
TR = Vault cash + Deposits at the Fed = $100
RR = (D)(rrr) = ($100)(0.10) = $10
ER = TR – RR = $100 – $10 = $90
MS = $100
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Money Creation
Smith Deposit Account $100
Jones Deposit Account $100
Cash $100
Loan to Jones $100
Suppose the bank makes a loan for $100 to Jones. The bank’s accounts are
The bank’s reserve calculations and the money supply are
Customer Deposits = D = $200
TR = Vault cash + Deposits at the Fed = $100
RR = (D)(rrr) = ($200)(0.10) = $20
ER = TR – RR = $100 – $20 = $80
MS = $200
© Copyright 2007. Do not distribute or copy without permission. 435
Money Creation
Smith Deposit Account $200
Jones Deposit Account $100
Cash $100
Loan to Jones $100
Loan to Smith $100
Suppose the bank makes a loan for $100 to Smith. The bank’s accounts are
The bank’s reserve calculations and the money supply are
Customer Deposits = D = $300
TR = Vault cash + Deposits at the Fed = $100
RR = (D)(rrr) = ($300)(0.10) = $30
ER = TR – RR = $100 – $20 = $70
MS = $300
© Copyright 2007. Do not distribute or copy without permission. 436
Money Creation
Smith Deposit Account $200
Jones Deposit Account $100
Other Deposit Accounts $700
Cash $100
Loan to Jones $100
Loan to Smith $100
Loans to Others $700
The bank can continue making loans until its excess reserves fall to zero. When this happens, the bank looks like this
The bank’s reserve calculations and the money supply are
Customer Deposits = D = $1,000
TR = Vault cash + Deposits at the Fed = $100
RR = (D)(rrr) = ($1,000)(0.10) = $100
ER = TR – RR = $100 – $100 = $0
MS = $1,000
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Money Creation
Notice that the maximum size of the money supply is a function of two things:
1. Cash2. Bank deposits at the Fed
Together, we call these two things the monetary base (or “high powered money”).
The money supply reaches its maximum possible size when:
1. People hold no cash (i.e. all of the economy’s cash is deposited in banks).
2. Banks maintain zero excess reserves.
Monetary BaseMaximum size of the money supply
rrr
Money multiplier = 1 / rrr
© Copyright 2007. Do not distribute or copy without permission. 438
Check Clearing Process
Suppose Jones’ account is at Bank A while Smith’s account is at Bank B. The two banks’ accounts are as follows:
Jones Deposit Account $100
Bank B Deposit Account $800
Other Deposit Accounts $700
Cash $100
Deposits at Bank B $500
Deposits at Fed $1,000
Bank A
Smith Deposit Account $300
Bank B Deposit Account $500
Other Deposit Accounts $1,450
Cash $750
Deposits at Bank A $800
Deposits at Fed $700
Bank B
© Copyright 2007. Do not distribute or copy without permission. 439
Check Clearing Process
Smith writes Jones a check for $175 drawn on his account at Bank B. Jones deposits the check in her account at Bank A.
Jones Deposit Account $100+$175=$275
Bank B Deposit Account$800–$175=$625
Other Deposit Accounts $700
Cash $100
Deposits at Bank B $500
Deposits at Fed $1,000
Bank A
Because the check is drawn on Bank B, Bank A transfers $175 from Bank B’s account to Jones’ account.
Smith Deposit Account$300–$175=$125
Bank B Deposit Account $500
Other Deposit Accounts $1,450
Cash $750
Deposits at Bank A$800–$175=$625
Deposits at Fed $700
Bank B
Bank B registers that its deposits at Bank A have declined by $175 and reduces Smith’s account by the same amount.
Neither bank’s equity changed because the transaction did not involve the banks’ money.
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Check Clearing Process
If two banks do not maintain mutual deposits, then the Fed aids the check clearing process.
Suppose the two banks begin as follows:
Jones Deposit Account $100
Other Deposit Accounts $700
Cash $100
Deposits at Fed $700
Bank A
Smith Deposit Account $300
Other Deposit Accounts $1,450
Cash $750
Deposits at Fed $1,000
Bank B
Smith writes Jones a check for $175 drawn on his account at Bank B. Jones deposits the check in her account at Bank A.
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Check Clearing Process
Jones Deposit Account $100+$175=$275
Other Deposit Accounts $700
Cash $100
Deposits at Fed $700+$175=$875
Bank A
Smith Deposit Account$300–$175=$125
Other Deposit Accounts $1,450
Cash $750
Deposits at Fed $1,000–$175=$825
Bank B
Cash outstanding $850
Bank A Deposits $700+$175=$875
Bank B Deposits $1,000–$175=$825
Treasury Bills $2,550
Fed
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Monetary Policy
The Fed has three tools it uses to conduct monetary policy.
1. Reserve requirement ratio2. Discount rate3. Open market operations
Reserve requirement ratio
By decreasing (increasing) the reserve requirement ratio, banks are better (less) able to create money.
In practice, the Fed alters the reserve requirement ratio infrequently. Frequent changes will cause banks to hold a lot of excess reserves (to guard against increases in the rrr). As a result, changes in the rrr will end up having little impact.Discount rate
In practice, the Fed discourages banks from borrowing except when most necessary (e.g. during the Christmas season when there are significant cash withdrawals, reducing bank reserves). Over borrowing is an indication of a bank extended more loans than (on average) it has reserves to back.
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Monetary Policy
The Fed has three tools it uses to conduct monetary policy.
1. Reserve requirement ratio2. Discount rate3. Open market operations
Open market operations
The most widely used tool of the Fed is open market operations. With OMO, the Fed buys or sells securities (usually government bonds) on the open market. When the Fed purchases bonds from banks, it increases the banks’ deposits at the Fed, thereby increasing the banks’ reserves. When the Fed sells bonds to banks, it decreases the banks’ deposits at the Fed, thereby decreasing bank reserves.
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Monetary Policy
By altering the money supply, the Fed can influence two economic measures: inflation and interest rates.
Quantity Theory of Money: How money supply changes affect prices
The quantity theory of money holds that the money supply is related to prices by the following formula.
Mv PYM = money supply
v = velocity of money (number of times a dollar changes hands over a year)
P = IPD
Y = full-employment RGDPIf velocity is constant (which it tends to be, at least over the short run), and the economy is at full employment, an increase in the money supply causes inflation only.
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Money Demand
Money demand is not the demand for “money” – it is the demand for holding one’s wealth in the form of money rather than in an illiquid form.
Cost to holding wealth in form of money money yields a low (sometimes negative, often zero) return.
Components of money demand
1. Transactions demand desire to hold wealth in liquid form for purpose of conducting transactions.
2. Speculative demand desire to hold wealth in liquid form for purpose of taking advantage of investment opportunities.
3. Precautionary demand desire to hold wealth in liquid form for purpose of protecting against unforeseen events.
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Money Demand
M/P
R
M/P “real money” (i.e. purchasing power)
R nominal interest rate
MD
Holding wealth in the form of money makes it easier to conduct transactions, but yields a low return.
MD is downward sloping because, as interest rates rise, the opportunity cost of holding wealth in the form of money rises.
© Copyright 2007. Do not distribute or copy without permission. 447
Money Supply
M/P
R MS
Because the money supply is determined by the Fed, it is constant with respect to interest rates.
MD
Equilibrium interest rate
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Money Supply
M/P
R MS
By increasing the money supply (via one of the three policy tools), the Fed causes interest rates to decline.
MD
MS’
5.0%
4.9%
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Money Supply
M/P
R MS
In practice, the Fed uses the Federal Funds Rate (the interest rates that banks charge each other for loans) as a target for monetary policy. The Fed will select a level for the Federal Funds Rate (e.g. 4.9%) and then continually adjust the money supply so as to maintain the Federal Funds Rate at the target level.
This is why the media refer to the Fed “lowering the interest rate” when, in fact, the interest rate is determined by market forces. Technically, the Fed increases the money supply.
MD
MS’
5.0%
4.9%
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Monetary and Fiscal Policies
When the interest rate falls, it becomes less expensive to borrow. As a result, investment rises. As investment rises, AD rises. As AD rises, RGDP and prices rise.Expansionary Monetary Policy
MS R I AD RGDP
P
Contractionary Monetary Policy
MS R I AD RGDP
P
Expansionary Fiscal Policy
G AD RGDP
P
T C AD RGDP
P
Contractionary Fiscal Policy
G AD RGDP
P
T C AD RGDP
P
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Monetary Policy
M/P
R MS
MD
5.0%
Pri
ce
Ind
ex
RGDP
LRAS
AD
SRAS
4.9%
MS R
MS’
MS
AD’
I AD
AD RGDP
R I
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Monetary Policy
M/P
R MS
MD
5.0%
Pri
ce
Ind
ex
RGDP
LRAS
AD
SRAS
MS’
MS
Notice that expansionary policy (either fiscal or monetary) has the desired effect only if the economy is operating below full employment.
A
Economy starts at Point A. Increase in MS causes interest rates to fall, investment to rise, and AD to rise. Economy moves to Point B. Economy is now in over employment. Increases in resource prices decrease SRAS. Economy moves to Point C.
4.9%
MS R
AD’B
R I AD CSRAS’
Over employment
causes SRAS
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Absolute vs. Relative Advantage
A nation is said to have an absolute advantage in the production of a product if it can produce that product at a lower cost than another nation.
US JapanCost to produce 1 car (US$, PPP) $10,000 $12,000Cost to produce 1 computer (US$, PPP) $2,000 $4,000
In this example, we say that the US has an absolute advantage in the production of both cars and computers.
One might argue that these two countries will not trade because the US can produce both products more cheaply than Japan.
This argument is erroneous because it focuses on the dollar (or “nominal”) cost of production rather than the opportunity cost (or “real cost”) of production.
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Absolute vs. Relative Advantage
US JapanCost to produce 1 car (US$, PPP) $10,000 $12,000Cost to produce 1 computer (US$, PPP) $2,000 $4,000
Example
In the US, to produce one additional car requires moving $10,000 worth of resources out of the production of computers and into the production of cars. Because each computer requires $2,000 worth of resources, the cost of producing one additional car is a loss of 5 computers.
In Japan, to produce one additional car requires moving $12,000 worth of resources out of the production of computers and into the production of cars. Because each computer requires $4,000 worth of resources, the cost of producing one additional car is a loss of 3 computers.
We say that Japan has a relative advantage in the production of cars because the opportunity cost of producing a car in Japan is less than the opportunity cost of producing a car in the US.
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Absolute vs. Relative Advantage
US JapanCost to produce 1 car (US$, PPP) $10,000 $12,000Cost to produce 1 computer (US$, PPP) $2,000 $4,000
Example
Similarly, in the US, to produce one additional computer requires moving $2,000 worth of resources out of the production of cars and into the production of computers. Because each car requires $10,000 worth of resources, the cost of producing one additional computer is a loss of 0.20 cars.
In Japan, to produce one additional computer requires moving $4,000 worth of resources out of the production of cars and into the production of computers. Because each car requires $12,000 worth of resources, the cost of producing one additional computer is a loss of 0.33 cars.
We say that the US has a relative advantage in the production of computers because the opportunity cost of producing a computer in the US is less than the opportunity cost of producing a computer in Japan.
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Absolute vs. Relative Advantage
Example
Suppose that Mexican and American labor is equally productive. The chart below shows productivity figures for the two countries’ workers.
Intuition would suggest that Mexico will produce both sneakers and shirts and that the US will produce nothing. This argument is incorrect because it is based on absolute, not relative advantage.
US MexicoPairs of sneakers 1 worker can produce per hour 10 20Shirts 1 worker can produce per hour 20 10
Suppose also that Mexican labor is cheaper than American labor. The chart below shows wages in the two countries.
Labor Cost per Hour (US$, PPP)US $9.00Mexico $2.00
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Absolute vs. Relative Advantage
Combining these two charts, we find the cost to produce shirts and sneakers in each country.
In Mexico, the opportunity cost of producing 1 more shirt is 2 pairs of sneakers. In the US, the opportunity cost of producing 1 more shirt is ½ of a pair of sneakers.
Mexico has a relative advantage in the production of sneakers and the US has a relative advantage in the production of shirts.
US MexicoPairs of sneakers 1 worker can produce per hour 10 20Shirts 1 worker can produce per hour 20 10
Labor Cost per Hour (US$, PPP)US $9.00Mexico $2.00
US MexicoCost to produce 1 pair of sneakers (US$, PPP) $0.90 $0.10Cost to produce 1 shirt (US$, PPP) $0.45 $0.20
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Absolute vs. Relative Advantage
Relative advantage suggests that Mexico will produce only sneakers and the US will produce only shirts – despite the fact that Mexican labor is significantly cheaper than US labor.
US MexicoCost to produce 1 pair of sneakers (US$, PPP) $0.90 $0.10Cost to produce 1 shirt (US$, PPP) $0.45 $0.20
Mexico produces only sneakers but wants more shirts. There are two alternatives:
1. Mexico diverts resources out of the production of sneakers and into the production of shirts. Result: Mexico gains 1 shirt at a loss of 2 sneakers.
2. Mexico trades sneakers to the US in exchange for shirts. Result: Mexico gains 1 shirt at a loss of 1 sneaker.
It is better for Mexico to trade its shirts to the US for sneakers rather than to produce sneakers itself.
Suppose Mexico and the US can exchange shirts for sneakers at a rate of 1-for-1.
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Absolute vs. Relative Advantage
US MexicoCost to produce 1 pair of sneakers (US$, PPP) $0.90 $0.10Cost to produce 1 shirt (US$, PPP) $0.45 $0.20
The US produces only shirts but wants more sneakers. There are two alternatives:
1. The US diverts resources out of the production of shirts and into the production of sneakers. Result: US gains 1 sneaker at a loss of 2 shirts.
2. The US trades shirts to Mexico in exchange for sneakers. Result: US gains 1 sneaker at a loss of 1 shirt.
It is better for the US to trade its sneakers to Mexico for shirts rather than to produce shirts itself.
Suppose Mexico and the US can exchange shirts for sneakers at a rate of 1-for-1.
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Absolute vs. Relative Advantage
Conclusion:
Trade does not occur because of the cost of domestic labor vs. foreign labor.
Trade does not occur because of the productivity of domestic labor vs. foreign labor.
Trade occurs because of the cost and productivity of domestic labor employed in the production of one good vs. the cost and productivity of domestic labor employed in the production of another good.
Example
Because the US has a relative advantage in the production of agricultural products and a relative disadvantage in the production of automobiles, you support American car manufacturers when you buy American cars. But, you support American farmers when you buy foreign cars.
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Trade
Trade is the combination of specialization and exchange. Countries specialize in the production of those products in which they have competitive advantages, and then exchange some of those products for products in which they do not have competitive advantages.
In practice, countries do not perfectly specialize because of the production phenomena of specialization and congestion. The more a country focuses on the production of one product, the more congestion occurs in the firms producing that product and the more opportunities for specialization arise in firms producing other products. This results in countries partially specializing.
Warning: Unfortunately, the word “specialization” occurs here with two different meanings. In reference to a country, “specialization” means “to focus resources on the production of a specific product.” In reference to a firm, “specialization” means “an increase in factors employed by the firm causes a proportionally greater increase in units produced.”
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Trade
Misconceptions about trade
1. Trade exploits foreign workers.
Reality: US firms that employ foreign labor overseas do pay foreigners less than what American workers earn, but more than the foreigners would have earned from native firms.
Example: In 2000, Nike paid its Indonesian workers $720 per year. This is far less than the average US worker earns ($32,000 per year), but far more than the average Indonesian worker earns ($240 per year).
Example: Mexican firms that produce exportable products pay their workers 10% to 70% more than Mexican firms that do not produce exportable products.
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Trade
Misconceptions about trade
2. Trade eliminates US jobs.
Reality: US jobs that compete with foreign-made imports are reduced. However, US jobs that provide foreign-purchased exports are gained. Also, US jobs that use foreign-made imports are gained.
Example: Inflow of cheaper foreign steel hurts US steelworkers, but helps US automobile and US tire workers. Countries that gain income from selling steel to the US are better able to afford American exports. This helps US farmers.
3. Trade leads to a reduction in competition and a consolidation of power in the hands of a few large multi-national firms.
Reality: Trade increases the number of consumers and producers and so increases competition. Increased competition decentralizes economic power.
Example: There are currently 40,000 multi-national firms. This number is far too large to allow for collusion. Also, the number of multi-national firms is growing faster than the world economy. This means that, on average, the economic power of individual multi-national firms is declining.
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Trade
Using Economy.com’s database, download quarterly data on exports, imports, and GDP (in current dollars), and the unemployment rate over the period 1980.1 through the present.
Calculate “relative trade” as (Exports + Imports) / GDP.
Create a graph of unemployment compared to relative trade.
0
2
4
6
8
10
12
0.15 0.17 0.19 0.21 0.23 0.25 0.27 0.29
Relative Trade
Un
emp
loym
ent
Rat
e (%
)
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Exchange RatesThink of a currency as a product. The exchange rate is the price of that product. The demand for a currency is determined by foreigners who want to buy products and investments denominated in that currency.
£
E
D
The demand for pounds is determined by foreigners who want to purchase pounds either (1) as an investment, (2) for the purpose of purchasing British products, or (3) for the purpose of purchasing British investments.
The exchange rate (E = $/£) is the price (in US dollars) of a pound.
When E rises, it becomes more expensive for Americans to buy pounds, so the quantity of pounds demanded (by Americans) falls.
When E falls, it becomes cheaper for Americans to buy pounds, so the quantity of pounds demanded (by Americans) rises.
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Exchange Rates
The supply of pounds is determined by British who want to sell pounds (for foreign currency) either (1) as an investment, (2) for the purpose of purchasing foreign products, or (3) for the purpose of purchasing foreign financial instruments.
£
ES
The exchange rate (E = $/£) is the price (in US dollars) of a pound.
When E rises, it becomes more profitable for the British to sell pounds (to the Americans), so the quantity of pounds supplied (by the British) rises.
When E falls, it becomes less profitable for the British to sell pounds (to the Americans), so the quantity of pounds supplied (by the British) falls.
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Exchange Rates
The equilibrium exchange rate is the price of pounds that causes quantity demanded of pounds to equal quantity supplied of pounds.
£
ES
D
Equilibrium exchange rate ($/ £)
Equilibrium quantity of pounds bought/sold
daily
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Exchange Rates
A change in the exchange rate implies a change in the relative values of the two currencies.
Exchange rates are typically expressed as Domestic/Foreign. However, because the definition of “domestic” and “foreign” changes depending on one’s perspective, you should always verify which currency is in the numerator and which is in the denominator.
Suppose the exchange rate starts at $2.00/£. This is the same as £0.50/$.
An increase in the exchange rate to $2.10/£ implies that the pound has become more valuable relative to the dollar.
Because $2.10/£ is the same as £0.48/$, the dollar has become less valuable relative to the pound.
If the exchange rate is expressed as Domestic/Foreign, then an increase in the exchange rate means that the domestic currency has become less valuable and a decrease in the exchange rate means that the domestic currency has become more valuable.
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Exchange Rates
Notice that, like in any market, the exchange rate (i.e. the price) changes when there is a change in either the demand or supply of pounds.
£
ES
D
$1.82
1. The exchange rate starts at $1.82 per pound.
2. An increase in real interest rates in the US causes US financial instruments to be more attractive to British investors. This is a positive shock to the supply of pounds.
3. Supply of pounds increases causing a decline in the exchange rate.
S’
$1.75
A decline in the exchange rate means that dollars have become more valuable.
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Exchange Rates
Notice that, like in any market, the exchange rate (i.e. the price) changes when there is a change in either the demand or supply of pounds.
£
ES
D
$1.82
1. The exchange rate starts at $1.82 per pound.
2. Americans demand more British goods. This is a positive shock to the demand for pounds.
An increase in the exchange rate means that dollars have become less valuable.
3. Demand for pounds increases causing an increase in the exchange rate.
$1.87
D’
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Exchange Rate Regimes
An exchange rate regime is a method for determining the exchange rate.
Exchange rates are usually determined by one of three methods.
1. Floating rate Exchange rate is determined by forces of demand and supply. This is also called the “free market rate.”
2. Fixed rate Exchange rate is set by a government. Example: The exchange rate of the Bahamian dollar with the US dollar is fixed by the Bahamian government at 1.
3. Dirty float A government will allow the exchange rate to be determined by market forces provided that the rate stays within some bounds set by the government. If the rate moves outside those bounds, the government will intervene to hold the rate at the bound until such time as market forces act to move the rate back within the bounds. This is also called a “managed float.” Example: The Hong Kong monetary authority will not allow the exchange rate to fall below $HK7.8/$US
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Exchange Rate Regimes
A fixed rate or dirty float regime is like a price ceiling and price floor together.
The major difference is that, whereas price controls can be enforced by law, a government cannot legally enforce fixed rates because many (if not most) of the exchange rate transactions involving its currency occur outside the country’s borders.To maintain a fixed rate or dirty float, a government must intervene in the market place by buying up its currency to lower the exchange rate and selling its currency to raise the exchange rate.
Example
The Russian government wants to hold the exchange rate at $0.04/RUB. Because of a decline in the demand for rubles, the exchange rate starts to fall. To counteract the decline in the exchange rate, the Russian government begins buying rubles on the market. The Russian government’s purchases constitute an increase in demand. The government continues to purchase until the market rate rises back to $0.04/RUB.
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Exchange Rate Regimes
Question
What does the Russian government use to buy up rubles on the open market? The government must use its stock of foreign currencies (e.g. dollars, pounds, etc.) that it has acquired over time.
Problem
The Russian government can’t print foreign currency. Once it runs out of foreign currency, it is no longer able to buy up rubles and so can no longer support a falling exchange rate.
This happened in August 1998 when Russia was forced to devalue the ruble because Russia had run out of foreign currency with which to buy up rubles.
Result: In the course of 24 hours, the ruble fell by an amount that it otherwise would have fallen over the course of a year or more.
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Exchange Rate Regimes
Ruble-Dollar Exchange Rate (1/1/98 - 12/31/98)
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
$/R
UB
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Exchange Rate Regimes
Ruble-Dollar Exchange Rate (1/1/98 - 12/31/98)
0
5
10
15
20
25
RU
B/$
© Copyright 2007. Do not distribute or copy without permission. 476
Exchange Rate Regimes
Dollar-Euro Exchange Rate (1/1/01 - 6/9/05)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
$/E
CU
2001 2002 2003 2004
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Exchange Rate Regimes
Terminology
In a floating exchange rate regime, when a currency becomes more valuable, it is said to appreciate. When a currency becomes less valuable it is said to depreciate.
In a fixed exchange rate regime, when a currency is made more valuable, it is said to be revalued. When a currency is made less valuable, it is said to be devalued.
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Impact of Exchange Rate FluctuationsExample
Suppose exchange rate is floating and is currently RUB 4 / $.
Russia exports caviar at a price of RUB 2 each. The US exports Coke at a price of $0.50 each.
Russian Importer
Russian Bank
US Exporter
2 Cokes
$1
RUB 4 $1
Russian Exporter
2 caviar
RUB 4
US Importer
US Bank
$1 RUB 4
Flows of currency
Russia: +RUB 4–$1
US: –RUB 4 +$1
Russian Bank
US Bank
RUB 4 $1
Flows after banks exchange surplus currency
Russia: +RUB 0–$0
US: –RUB 0 +$0
© Copyright 2007. Do not distribute or copy without permission. 479
Impact of Exchange Rate Fluctuations
Now, suppose Russia fixes the exchange rate at RUB 2 / $.
Russia exports caviar at a price of RUB 2 each. The US exports Coke at a price of $0.50 each.
Russian Importer
Russian Bank
US Exporter
4 Cokes
$2
RUB 4 $2
Russian Exporter
1 caviar
RUB 2
US Importer
US Bank
$1 RUB 2
Flows of currency
Russia: +RUB 2–$2
US: –RUB 2 +$2
Russian Bank
US Bank
RUB 2 $1
Flows after banks exchange surplus currency
Russia: +RUB 0–$1
US: –RUB 0 +$1
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Impact of Exchange Rate Fluctuations
Impact of fixing the exchange rate at an artificially low level.
Some People are Better Off
1. The Russian importer buys more Coke at the same price.
2. The US exporter sells more Coke at the same price.
Some People are Worse Off
1. The Russian exporter sells less caviar at the same price.
2. The US importer buys less caviar at the same price.
Russia is Bleeding US Dollars
When the Russian bank attempts to buy back the dollars that left the country, it finds that it does not have enough rubles to buy back all of the dollars. The government bought the remainder in an effort to maintain the artificially low exchange rate.
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Impact of Exchange Rate Fluctuations
The alteration in the exchange rate impacts not only exporters and importers, but also Russian investors investing in US securities and US investors investing in Russian securities.
Suppose the exchange rate is $0.50/RUB.
US Investor
US Bank
Russian Firm
Bond @ FV RUB 30
RUB 20
$10 RUB 20
Russian Firm
RUB 30 Bond
US Investor
US Bank
RUB 30 $15
Time
The US investor made a 50% return on the investment, but incurred (in addition to default risk) exchange rate risk.
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Impact of Exchange Rate Fluctuations
Suppose the exchange rate is $0.50/RUB initially. But, after the US investor purchases the bond, Russia devalues its currency to $0.25/RUB.
US Investor
US Bank
Russian Firm
Bond @ FV RUB 30
RUB 20
$10 RUB 20
Russian Firm
RUB 30 Bond
US Investor
US Bank
RUB 30 $7.50
Time
The US investor incurred a 25% loss on the investment due to the alteration in the exchange rate.
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Impact of Exchange Rate Fluctuations
Impact of depreciation or devaluing of a currency.
Some People are Better Off
1. Russian investors who had invested in US firms prior to the exchange rate change receive back currency (dollars) that is worth more than the currency they invested.
2. US firms that had borrowed from Russian investors prior to the exchange rate change pay back currency (rubles) that is worth less than the currency they borrowed.
Some People are Worse Off
1. US investors who had invested in Russian firms prior to the exchange rate change receive back currency (rubles) that is worth less than the currency they invested.
2. Russian firms who had borrowed from US investors prior to the exchange rate change pay back currency (dollars) that is worth more than the currency they borrowed.
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Hedging Exchange Rate Risk
Exchange rate risk can be hedged via currency options and futures.
A futures contract is a bilateral agreement to buy/sell a quantity of foreign currency at a specified future date and at a specified price.
An options contract is a unilateral agreement in which the holder of the option has the right (but not the obligation) to buy or sell a quantity of foreign currency at any time up to a specified future date and at a specified price (the “strike price”).A call option gives the contract holder the right to buy the currency. A put option gives the contract holder the right to sell the currency.
The holder of the contract pays the issuer of the contract a contract premium which the issuer keeps regardless of whether or not the holder executes the contract.
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Hedging Exchange Rate Risk
Suppose the exchange rate is $0.50/RUB initially. But, after the US investor purchases the bond, Russia devalues its currency to $0.25/RUB.
US Investor
US Bank
Russian Firm
Bond @ FV RUB 30
RUB 20
$10 RUB 20
Russian Firm
RUB 30 Bond
US Investor
Time
The US investor makes the expected 50% return less the premium paid for the futures contract.
Futures Market
premium
Contract to sell RUB 30 for $15
Futures Market
RUB 30
$15