LECTURE 22:MONEY

October 27, 2010

What is money?

Although we commonly think of “money” as being dollar bills and coins, these are by no means the only items that can act as “money.”

Money must fulfill three functions: Medium of exchange Store of value Unit of account

Medium of exchange

Problem with barter system: “Coincidence of wants.”

In a barter system, both people must have exactly what the other person wants, exactly when and where it’s wanted.

Medium of exchange eliminates this problem.

Definition: Anything used to facilitate trade and avoid a straight barter system.

Anything can serve as money so long as people are willing to accept it.

Store of value

US dollars are what is called fiat money: They have no intrinsic value. Rather, their value is a function of the US government saying they have value.

This is true for most nations’ currencies: They are backed only by the faith and credit of the given country’s government.

“This note is legal tender for all debts, public and private.”

Money need not be convertible into something with intrinsic value (e.g., gold).

Unit of account

Standard unit of measurement of the value/cost of goods, services, or assets.

Analogy: I go to WeShop and pay $10 for a gallon of milk. Gallon : size :: dollar : price Take away the price units: A gallon of milk

simply costs “10.” 10 what? Another example: “GM incurred losses of

700 million in the second quarter.” The dollar sign lends meaning to the phrase.

Mildly amusing examples

Yap (island in the Pacific Ocean) uses stones ranging from 1.4 inches to 12 feet in diameter

Yap stone

Mildly amusing examples

Yap (island in the Pacific Ocean) uses stones ranging from 1.4 inches to 12 feet in diameter

Cigarettes are often used in prison as money Ithaca, NY, has its own currency, the Ithaca

HOUR. One Ithaca HOUR is valued at $10 Ithaca HOURs cannot be converted to US dollars Businesses that receive HOURs must spend them

on local goods and services Ithaca inspired similar systems in Madison, WI,

and Corvallis, OR

What determines money demand?

Needed for transactionsMoney demand in its most simple form

Asset-holding motives Precautionary (i.e., money people want in

case of emergency) Speculative (need for cash to take advantage

of investment opportunities that may arise)

Measures of money

M1, M2, M3 M1: Physical currency + demand deposits (i.e.,

checking accounts) M2: M1 + savings accounts + money market

accounts + small-denomination time deposits (CDs under $100,000)

M3: M2 + all other CDs + repurchase agreements M1 and M2 are the most commonly used

measures M3 conveys no additional information about economic

activity, according to Fed, though some politicians (Ron Paul) have criticized its decision to cease collecting M3 statistics in March ’06.

Balance sheet

A balance sheet indicates a bank’s assets, liabilities, and net worth. Assets = reserves + loans Liabilities = deposits + net worth Net worth = assets – liabilities (accounting

identity) Both sides of the balance sheet must

balance! The accounting identity was developed in the

15th century as a means for identifying accounting errors

Example of balance sheet

Money creation

Banks are required to keep a certain percentage of their deposits in reserve. The percentage they must keep is called the reserve

ratio and is set by the Fed. Banks can choose to keep additional reserves beyond

the requirement. Banks are free to lend out the rest of their

deposits. These loans make their way to other banks, which in turn loan them out, and so on.

Downside: This can lead to “bank runs,” such as what partially precipitated the Great Depression.

Example!

Creation of money$100,000 deposit, rr = 20%

Now the bank loans outits excess reserves…

Those loans become anotherbank’s deposits…

That bank’s loans becomeanother bank’s deposits…

…and so on.

Money creation

This cycle shows how banks can create money. The money multiplier describes the total

increase in money resulting from a $1 increase in MS by the central bank.

Money multiplier = 1/rr So, for example, if rr = 20%, a $1 increase in

Ms by the central bank will increase the money supply in total by $5.

Note that the effect of the money multiplier is diminished if individuals increase their cash holdings.

What determines money supply?

Policymakers at the Fed determine the US money supply.

The Fed has three tools to change Ms: Reserve ratio Discount rate (interest rate charged to banks

that borrow from the Fed) Open-market operations (buying and selling

bonds)

Open-market operations

When the Fed wishes to lower the money supply, it sells bonds (government securities) to the public. The money it receives from these transactions is retired (removed from circulation), so the net effect is to lower Ms.

Similarly, when the Fed wants to increase the money supply, it buys bonds from the public. The money multiplier acts to further increase Ms as well. (Money multiplier also works backwards when Fed sells bonds.)

Money supply, demand

Let’s bring money supply and money demand together on one graph!

Why is Md downward-sloping? Think of interest rate as the cost of holding

money Money sitting in your wallet does not earn

interest; the higher the interest rate, the more interest is foregone by holding onto money—so the opportunity cost of holding money is higher.

As output (Y) increases, Md increases (demanded for transactions)