macroeconomics fifth edition n. gregory mankiw powerpoint ® slides by ron cronovich macro © 2003...
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macroeconomics fifth edition
N. Gregory Mankiw
PowerPoint® Slides by Ron Cronovichm
acro
© 2003 Worth Publishers, all rights reserved
CHAPTER FOUR
Money and Inflation
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In this chapter you will learnIn this chapter you will learn
The classical theory of inflation– causes– effects– social costs
“Classical” -- assumes prices are flexible & markets clear.
Applies to the long run.
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U.S. inflation & its trend, 1960-2003U.S. inflation & its trend, 1960-2003
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U.S. inflation & its trend, 1960-2003U.S. inflation & its trend, 1960-2003
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The connection between The connection between money and pricesmoney and prices
Inflation rate = the percentage increase in the average level of prices.
price = amount of money required to buy a good.
Because prices are defined in terms of money, we need to consider the nature of money, the supply of money, and how it is controlled.
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Money: definitionMoney: definition
MoneyMoney is the stock is the stock of assets that can of assets that can be readily used to be readily used to make transactions.make transactions.
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Money: functionsMoney: functions
1.medium of exchangewe use it to buy stuff
2.store of valuetransfers purchasing power from the present to the future
3.unit of accountthe common unit by which everyone measures prices and values
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Money: typesMoney: types
1.fiat money• has no intrinsic value• example: the paper currency we
use
2.commodity money• has intrinsic value• examples: gold coins,
cigarettes in P.O.W. camps
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Discussion QuestionDiscussion Question
Which of these are money?
a. Currency
b. Checks
c. Deposits in checking accounts (called demand deposits)
d. Credit cards
e. Certificates of deposit (called time deposits)
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The money supply & monetary policyThe money supply & monetary policy
The money supply is the quantity of money available in the economy.
Monetary policy is the control over the money supply.
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The central bankThe central bank
Monetary policy is conducted by a country’s central bank.
In the U.S., the central bank is called the Federal Reserve (“the Fed”).
The Federal Reserve Building Washington, DC
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Money supply measures, Money supply measures, April 2002April 2002
_Symbol Assets included Amount (billions)_
C Currency $598.7
M1 C + demand deposits, 1174.0 travelers’ checks, other checkable deposits
M2 M1 + small time deposits,5480.1
savings deposits, money market mutual funds, money market deposit accounts
M3 M2 + large time deposits,8054.4
repurchase agreements, institutional money market mutual fund balances
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The Quantity Theory of MoneyThe Quantity Theory of Money
A simple theory linking the inflation rate to the growth rate of the money supply.
Begins with a concept called “velocity”…
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VelocityVelocity
basic concept: the rate at which money circulates
definition: the number of times the average dollar bill changes hands in a given time period
example: In 2003, • $500 billion in transactions• money supply = $100 billion• The average dollar is used in five
transactions in 2003• So, velocity = 5
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Velocity, Velocity, cont.cont.
This suggests the following definition:=TVM
where
V = velocity
T = value of all transactions
M = money supply
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Velocity, Velocity, cont.cont.
Use nominal GDP as a proxy for total transactions.
Then, PYVM↔=
where
P = price of output (GDP deflator)
Y = quantity of output (real GDP)
P Y = value of output (nominal GDP)
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The quantity equationThe quantity equation
The quantity equationM V = P Y
follows from the preceding definition of velocity.
It is an identity: it holds by definition of the variables.
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Money demand and the quantity equationMoney demand and the quantity equation
M/P = real money balances, the purchasing power of the money supply.
A simple money demand function: (M/P )d = k Y
wherek = how much money people wish to hold for each dollar of income. (k is exogenous)
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Money demand and the quantity equationMoney demand and the quantity equation
money demand: (M/P )d = k Y
quantity equation: M V = P Y
The connection between them: k = 1/V
When people hold lots of money relative to their incomes (k is high), money changes hands infrequently (V is low).
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back to the Quantity Theory of Moneyback to the Quantity Theory of Money
starts with quantity equation
assumes V is constant & exogenous: =VV
With this assumption, the quantity equation can be written as
↔=↔MVPY
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The Quantity Theory of MoneyThe Quantity Theory of Money, cont., cont.
How the price level is determined: With V constant, the money supply
determines nominal GDP (P Y ) Real GDP is determined by the
economy’s supplies of K and L and the production function (chap 3)
The price level is P = (nominal GDP)/(real GDP)
↔=↔MVPY
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The Quantity Theory of MoneyThe Quantity Theory of Money, cont., cont.
Recall from Chapter 2: The growth rate of a product equals the sum of the growth rates.
The quantity equation in growth rates:MVPYMVPYΔΔΔΔ+=+
The quantity theory of money assumes is constant, so = 0.VVVΔ
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The Quantity Theory of MoneyThe Quantity Theory of Money, cont., cont.
Let (Greek letter “pi”) denote the inflation rate:
MPYMPYΔΔΔ=+
PPΔ=
The result from the preceding slide was:
Solve this result
for to get
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The Quantity Theory of MoneyThe Quantity Theory of Money, cont., cont.
Normal economic growth requires a certain amount of money supply growth to facilitate the growth in transactions.
Money growth in excess of this amount leads to inflation.
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The Quantity Theory of MoneyThe Quantity Theory of Money, cont., cont.
ΔY/Y depends on growth in the factors of production and on technological progress (all of which we take as given, for now).
Hence, the Quantity Theory of Money predicts a one-for-one relation between changes in the money growth rate and changes in the inflation rate.
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International data on International data on inflation and money growthinflation and money growth
Inflation rate(percent, logarithmicscale)
1,000
10,000
100
10
1
0.1
Money supply growth (percent, logarithmic scale)0.1 1 10 100 1,000 10,000
Nicaragua
AngolaBrazil
Bulgaria
Georgia
Kuwait
USA
Japan Canada
Germany
Oman
Democratic Republicof Congo
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U.S. Inflation & Money Growth, 1960-2003U.S. Inflation & Money Growth, 1960-2003
0%
2%
4%
6%
8%
10%
12%
14%
1960 1965 1970 1975 1980 1985 1990 1995 2000
Inflation rate Inflation rate trend
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U.S. Inflation & Money Growth, 1960-2003U.S. Inflation & Money Growth, 1960-2003
0%
2%
4%
6%
8%
10%
12%
14%
1960 1965 1970 1975 1980 1985 1990 1995 2000
Inflation rate Inflation rate trend
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U.S. Inflation & Money Growth, 1960-2003U.S. Inflation & Money Growth, 1960-2003
0%
2%
4%
6%
8%
10%
12%
14%
1960 1965 1970 1975 1980 1985 1990 1995 2000
Inflation rate M2 growth rate Inflation rate trend M2 growth rate trend
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U.S. Inflation & Money Growth, 1960-2003U.S. Inflation & Money Growth, 1960-2003
0%
2%
4%
6%
8%
10%
12%
14%
1960 1965 1970 1975 1980 1985 1990 1995 2000
Inflation rate M2 growth rate Inflation rate trend M2 growth rate trend
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SeigniorageSeigniorage
To spend more without raising taxes or selling bonds, the govt can print money.
The “revenue” raised from printing money is called seigniorage (pronounced SEEN-your-ige)
The inflation tax:Printing money to raise revenue causes inflation. Inflation is like a tax on people who hold money.
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Inflation and interest ratesInflation and interest rates
Nominal interest rate, inot adjusted for inflation
Real interest rate, radjusted for inflation:
r = i
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The Fisher EffectThe Fisher Effect
The Fisher equation: i = r +
Chap 3: S = I determines r .
Hence, an increase in causes an equal increase in i.
This one-for-one relationship is called the Fisher effect.
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U.S. inflation and nominal interest rates, U.S. inflation and nominal interest rates, since 1954since 1954
Percent16
14
12
10
8
6
4
2
0
-2
Nominalinterest rate
Inflationrate
1950 1955 1960 1965 1970Year
1975 1980 1985 1990 20001995
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Inflation and nominal interest rates Inflation and nominal interest rates across countriesacross countries
Inflation rate (percent, logarithmic scale)
Nominal interest rate(percent, logarithmicscale)
100
10
11 10 100 1000
KenyaKazakhstan
Armenia
Nigeria
Uruguay
United Kingdom
United States
Singapore
GermanyJapan
France
Italy
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Exercise:Exercise:
Suppose V is constant, M is growing 5% per year, Y is growing 2% per year, and r = 4.
a. Solve for i (the nominal interest rate).
b. If the Fed increases the money growth rate by 2 percentage points per year, find Δi .
c. Suppose the growth rate of Y falls to 1% per year. What will happen to ? What must the Fed do if it wishes to
keep constant?
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Answers:Answers:
a. First, find = 5 2 = 3. Then, find i = r + = 4 + 3 = 7.
b. Δi = 2, same as the increase in the money growth rate.
c. If the Fed does nothing, Δ = 1. To prevent inflation from rising, Fed must reduce the money growth rate by 1 percentage point per year.
Suppose V is constant, M is growing 5% per year, Y is growing 2% per year, and r = 4.
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Two real interest ratesTwo real interest rates
= actual inflation rate (not known until after it has occurred)
e = expected inflation rate
i – e = ex ante real interest rate: the real interest rate people expect at the time they buy a bond or take out a loan
i – = ex post real interest rate:the real interest rate people actually end up earning on their bond or paying on their loan
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Money demand and Money demand and the nominal interest ratethe nominal interest rate
The Quantity Theory of Money assumes that the demand for real money balances depends only on real income Y.
We now consider another determinant of money demand: the nominal interest rate.
The nominal interest rate i is the opportunity cost of holding money (instead of bonds or other interest-earning assets).
Hence, i in money demand.
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The money demand functionThe money demand function
(M/P )d = real money demand, depends negatively on i
i is the opp. cost of holding money positively on Y
higher Y more spending so, need more
money
(L is used for the money demand function because money is the most liquid asset.)
()(,)dMPLiY=
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The money demand functionThe money demand function
When people are deciding whether to hold money or bonds, they don’t know what inflation will turn out to be.
Hence, the nominal interest rate relevant for money demand is r + e.
()(,)dMPLiY=
(,)eLrY+=
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EquilibriumEquilibrium(,)eMLrYP=+
The supply of real money balances
Real money demand
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What determines whatWhat determines what
variable how determined (in the long run)
M exogenous (the Fed)
r adjusts to make S = I
Y
(,)eMLrYP=+
(,)YFKL=
P adjusts to make
(,)MLiYP=
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How How PP responds to responds to ΔΔMM
For given values of r, Y, and e,
a change in M causes P to change by the same percentage --- just like in the Quantity Theory of Money.
(,)eMLrYP=+
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What about expected inflation?What about expected inflation?
Over the long run, people don’t consistently over- or under-forecast inflation, so e = on average.
In the short run, e may change when people
get new information.
EX: Suppose Fed announces it will increase M next year. People will expect next year’s P to be higher, so e rises.
This will affect P now, even though M hasn’t changed yet. (continued…)
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How How PP responds to responds to ΔΔee
(,)eMLrYP=+
(the Fisher effect)ei−?−()d MP?⎠
() to make fall to re-establish eq'mPMP?−
For given values of r, Y, and M ,
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Discussion Question Discussion Question
Why is inflation bad? What costs does inflation impose on
society? List all the ones you can think of.
Focus on the long run.
Think like an economist.
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A common misperceptionA common misperception
Common misperception: inflation reduces real wages
This is true only in the short run, when nominal wages are fixed by contracts.
(Chap 3) In the long run, the real wage is determined by labor supply and the marginal product of labor, not the price level or inflation rate.
Consider the data…
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Average hourly earnings & the CPIAverage hourly earnings & the CPI
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The classical view of inflationThe classical view of inflation
The classical view: A change in the price level is merely a change in the units of measurement.
So why, then, is inflation So why, then, is inflation a social problem?a social problem?
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The social costs of inflationThe social costs of inflation
…fall into two categories:
1. costs when inflation is expected
2. additional costs when inflation is
different than people had expected.
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The costs of expected inflation: The costs of expected inflation: 11.. shoeleather costshoeleather cost
def: the costs and inconveniences of reducing money balances to avoid the inflation tax.
i
real money balances
Remember: In long run, inflation doesn’t affect real income or real spending.
So, same monthly spending but lower average money holdings means more frequent trips to the bank to withdraw smaller amounts of cash.
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The costs of expected inflation: The costs of expected inflation: 22.. menu costsmenu costs
def: The costs of changing prices.
Examples:– print new menus– print & mail new catalogs
The higher is inflation, the more frequently firms must change their prices and incur these costs.
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The costs of expected inflation: The costs of expected inflation: 33.. relative price distortionsrelative price distortions
Firms facing menu costs change prices infrequently.
Example: Suppose a firm issues new catalog each January. As the general price level rises throughout the year, the firm’s relative price will fall.
Different firms change their prices at different times, leading to relative price distortions…
…which cause microeconomic inefficiencies in the allocation of resources.
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The costs of expected inflation: The costs of expected inflation: 44.. unfair tax treatmentunfair tax treatment
Some taxes are not adjusted to account for inflation, such as the capital gains tax.
Example: Jan 1: you bought $10,000 worth of
Starbucks stock Dec 31: you sold the stock for $11,000,
so your nominal capital gain was $1000 (10%).
Suppose = 10% during the year. Your real capital gain is $0.
But the govt requires you to pay taxes on your $1000 nominal gain!!
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The costs of expected inflation: The costs of expected inflation: 55.. General inconvenienceGeneral inconvenience
Inflation makes it harder to compare nominal values from different time periods.
This complicates long-range financial planning.
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Additional cost of Additional cost of unexpectedunexpected inflation: inflation: arbitrary redistributions of purchasing powerarbitrary redistributions of purchasing power
Many long-term contracts not indexed, but based on e.
If turns out different from e, then some gain at others’ expense.
Example: borrowers & lenders • If > e, then (i ) < (i e)
and purchasing power is transferred from lenders to borrowers.
• If < e, then purchasing power is transferred from borrowers to lenders.
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Additional cost of high inflation: Additional cost of high inflation: increased uncertaintyincreased uncertainty
When inflation is high, it’s more variable and unpredictable: turns out different from e more often, and the differences tend to be larger (though not systematically positive or negative)
Arbitrary redistributions of wealth become more likely.
This creates higher uncertainty, which makes risk averse people worse off.
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One benefit of inflationOne benefit of inflation
Nominal wages are rarely reduced, even Nominal wages are rarely reduced, even when the equilibrium real wage falls. when the equilibrium real wage falls.
Inflation allows the real wages to reach Inflation allows the real wages to reach equilibrium levels without nominal wage equilibrium levels without nominal wage cuts.cuts.
Therefore, moderate inflation improves Therefore, moderate inflation improves the functioning of labor markets. the functioning of labor markets.
Nominal wages are rarely reduced, even Nominal wages are rarely reduced, even when the equilibrium real wage falls. when the equilibrium real wage falls.
Inflation allows the real wages to reach Inflation allows the real wages to reach equilibrium levels without nominal wage equilibrium levels without nominal wage cuts.cuts.
Therefore, moderate inflation improves Therefore, moderate inflation improves the functioning of labor markets. the functioning of labor markets.
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HyperinflationHyperinflation
def: 50% per month
All the costs of moderate inflation described
above become HUGE under hyperinflation.
Money ceases to function as a store of value, and may not serve its other functions (unit of account, medium of exchange).
People may conduct transactions with barter or a stable foreign currency.
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What causes hyperinflation?What causes hyperinflation?
Hyperinflation is caused by excessive money supply growth:
When the central bank prints money, the price level rises.
If it prints money rapidly enough, the result is hyperinflation.
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Recent episodes of hyperinflation Recent episodes of hyperinflation
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Why governments create hyperinflationWhy governments create hyperinflation
When a government cannot raise taxes or sell bonds,
it must finance spending increases by printing money.
In theory, the solution to hyperinflation is simple: stop printing money.
In the real world, this requires drastic and painful fiscal restraint.
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The Classical DichotomyThe Classical DichotomyReal variables are measured in physical units: quantities and relative prices, e.g.
quantity of output produced real wage: output earned per hour of work real interest rate: output earned in the future
by lending one unit of output today
Nominal variables: measured in money units, e.g. nominal wage: dollars per hour of work nominal interest rate: dollars earned in future
by lending one dollar today the price level: the amount of dollars needed
to buy a representative basket of goods
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The Classical DichotomyThe Classical Dichotomy
Note: Real variables were explained in Chap 3, nominal ones in Chap 4.
Classical Dichotomy : the theoretical separation of real and nominal variables in the classical model, which implies nominal variables do not affect real variables.
Neutrality of Money : Changes in the money supply do not affect real variables. In the real world, money is approximately neutral in the long run.
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Chapter summaryChapter summary
1.Money the stock of assets used for transactions
serves as a medium of exchange, store
of value, and unit of account. Commodity money has intrinsic value,
fiat money does not. Central bank controls money supply.
2.Quantity theory of money assumption: velocity is stable conclusion: the money growth rate
determines the inflation rate.
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Chapter summaryChapter summary
3.Nominal interest rate equals real interest rate + inflation rate. Fisher effect: nominal interest rate
moves one-for-one w/ expected inflation. is the opp. cost of holding money
4.Money demand depends on income in the Quantity
Theory more generally, it also depends on the
nominal interest rate; if so, then changes in expected inflation affect the current price level.
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Chapter summaryChapter summary
5.Costs of inflation Expected inflation
shoeleather costs, menu costs, tax & relative price distortions, inconvenience of correcting figures for inflation
Unexpected inflationall of the above plus arbitrary redistributions of wealth between debtors and creditors
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Chapter summaryChapter summary
6.Hyperinflation caused by rapid money supply
growth when money printed to finance govt budget deficits
stopping it requires fiscal reforms to eliminate govt’s need for printing money
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Chapter summaryChapter summary
7.Classical dichotomy In classical theory, money is neutral--
does not affect real variables. So, we can study how real variables are
determined w/o reference to nominal ones.
Then, eq’m in money market determines price level and all nominal variables.
Most economists believe the economy works this way in the long run.
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