# Lecture Outline1.

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Macroeconomics Series 2:

Money Demand, Money Supply and Quantity Theory of Money

by Dr. Charles Kwong School of Arts and Social Sciences The Open University of Hong Kong

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## 1. Demand for money

The Price Level

Nominal moneyis the quantity of money measured in dollars.

yThe quantity of nominal money demanded is proportional to the price level.

yIf price increases by 10%, people will hold 10% more of money to buy the same bundle of goods. For example, if you spent \$20 to buy a cup of tea and a toast before, now you need to hold \$2 more to buy the same bundle.

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Real money

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## 1. Demand for money

Financial Innovation

Changing technologies affect the quantity of money held. These include:

yDaily interest checking deposits

yAutomatic transfers between checking and savings deposits

yAutomatic teller machines

yCredit cards

In general, the above innovation reduces the demand for money.

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## 1. Demand for money

MD

Real money (trillions of 1992 dollars)

Interest rate (percent per year)

4 5 6

2.9 3.0 3.1

Effect of an increase in the interest rate

Effect of an increase in the interest rate

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## 1. Demand for money

Real money (trillions of 1992 dollars)

Interest rate (percent per year)

4 5 6

2.9 3.0 3.1

MD0 MD2

MD1

Effect of increase in real GDP

Effect of decrease in real GDP or financial innovation

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## 1. Demand for money

y Transactions Demand

§ Holding money as a medium of exchange to make payments

§ The stock of money people hold to pay everyday predictable expenses

§ The level varies directly with nominal national income.

§ This view was developed by classical economists and Keynes (1936) followed the classical view in his theory of liquidity preference.

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## 1. Demand for money

y Baumol-Tobin Model*: Transaction demand for money is negatively related to interest rates. When interest rates are high, people will minimize their holding of money for transaction purposes since the opportunity of holding money is high.

y However, to minimize money holding will incur higher transaction costs. So the interest rates mustbe high enough to generate benefits which can outweigh the higher transaction costs.

* Baumol, W. J. (1952), ‘The transaction s Demand for Cash: An Inventory Approach,’

Quaterly Journal of Economics, No. 66, pp. 545-556; Tobin, J. (1956), ‘The Interest Elasticity of the Transactions Demand for Cash,’ Review of Economics and Statistics, No. 38, pp. 241-247.

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## 1. Demand for money

y Precautionary Demand

y Holding money to meet unplanned/ unpredictable expenditures and emergencies

y Keynes believes that the precautionary money balances people wants to hold are determined primarily by the level of transactions they expect to make in the future. These transactions are proportional to income.

y When income rises, precautionary balances increases in order to provide the same degree of protection.

y Precautionay demand for money is negatively related to interest rates (models following the line of argument by Baumol and Tobin).

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## 1. Demand for money

y Asset Demand

y Keynes’s speculative motive: Keynes argues that people believe that there is a

“normal value” of interest rate. If the current interest rate is low, people will expect the interest rate to rise and bond price to fallin the future. If the fall in bond price outweighs the interest gain, people will suffer capital loss. Thus, they will demand more money because the zero return on money exceeds the negative return on bond.

y If the current interest rate is high, people will expect the interest rate to fall and bond price to rise in the future. If the rise in bond price outweighs the interest fall, people will enjoy capital gain. Thus, they will demand less money because the capital gain exceeds the zero return on money.

y Asset/Speculative demand for money is negatively related to interest rtaes.

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## 1. Demand for money

### Tobin’s Further Refinement*

y People not only care about the return on different assets, but also the riskiness of the return.

y The stock of money, with zero risk, people hold to take advantage of expected future changes in the priceof bonds, stocks, or other financial assets and to hedge against assets price fluctuation.

y The level of asset demand varies with the interest rate.

y As the interest rate falls, the opportunity cost of holding money falls, and people increase their speculative balances.

*Tobin, J. (1958), ‘Liuidity Preference as Behavior Towards Risk,’ Review of Economic Studies, No. 25, pp. 65-86.

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## 1. Demand for money

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### The Demand for Money Curve

Quantity of Money

Interest Rate

Md

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### The Demand for Money Curve

Quantity of Money

Interest Rate

Md

• When the interest rate rises the opportunity cost of holding money increases and the quantity of money demanded falls

• The location of Mdis determined by the level of income

Qmd1 B r2

r1 A

Qmd2

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## Lecture Outline

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### At any given moment in time, the quantity of real money supplied is a fixed amount since the Fed can influence the supply of money.

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2. Determination of interest rate in the money market

MS

Real money (trillions of 1992 dollars)

Interest rate (percent per year)

4 5 6

2.9 3.0 3.1

MD

Excess supply of money. People buy bonds and interest rate falls

Excess demand for money. People sell bonds and interest rate rises

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### 2. Determination of interest rate in the money market

Changing the Interest Rate

y Suppose the Fed begins to fear inflation.

y It decides to raise interest rates to discourage borrowing and the purchase of goods and services.

y To do so, the Fed sells securities in the open market.

y Bank reserves decline.

y Less new loans are made.

y The money supply decreases.

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2. Determination of interest rate in the money market

MS2 MS1

Real money (trillions of 1992 dollars)

Interest rate (percent per year)

4 5 6

MD MS0

2.9 3.0 3.2

2.8 3.1

An increase in the money supply lowers the interest rate

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A decrease in the money supply raises the interest rate

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Real GDP and Inflation rise Aggregate demand

increases Net

exports increase

Consumption and investment

increases The dollar falls in

the foreign exchange market

Interest rates fall Bank reserves increase,

and the quantity of money increases The Fed buys securities

in the open market

Real GDP and Inflation fall Aggregate demand

decreases Net

exports decrease

Consumption and investment

decreases The dollar rises in

the foreign exchange market

Interest rates rise Bank reserves decrease,

and the quantity of money decreases The Fed sells securities

in the open market

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### 3. Quantity Theory of Money

y The Effects of a Monetary Injection (MS↑) y Definition of quantity theory of

money: a theory asserting that the quantity of money available determines the price level and that the growth rate in the quantity of money available determines the inflation rate.

Positively Related

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### 3. Quantity Theory of Money

Milton Friedman

“Inflation is always and everywhere

a monetary phenomenon”

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### 3. Quantity Theory of Money

y The immediate effect of an increase in the money supply is to create an excess supply of money. (Once again, please be reminded that increase in money supply does not mean that it automatically increases the money holding by the people. It must go through the process that interest rates lower and money demand increases.)

y People try to get rid of this excess supplyin a variety of ways.

y They may buy goods and services with the funds.

y They may use these excess funds to make loans to others. These loans are then likely used to buy goods and services.

y In either case, the increase in the money supply leads to an increase in the demand for goods and services.

y Because the supply of goods and services has not changed, the result of an increase in the demand for goods and services will be higher prices.

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### 3. Quantity Theory of Money

Another perspective of Quantity Theory of Money

y How many times per year is the typical dollar bill used to pay for a newly produced good or service?

y Velocityand the Quantity Equation

yDefinition of velocity of money (V): the rate at which money changes hands.

yTo calculate velocity, we divide nominal GDP by the quantity of money.

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## 3. Quantity Theory of Money

Velocity and the Quantity Equation

y If P is the price level, Y is real GDP, and M is the quantity of money:

y Rearranging the terms, we get the quantity equation.

velocity = P Y M

×

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### 3. Quantity Theory of Money

Velocityand the Quantity Equation Suppose that:

y Real GDP = \$5,000

y Velocity = 5

y Money supply = \$2,000

y Price level = \$2

y We can show that:

y M x V = P x Y

y \$2,000 x 5 = \$2 x \$5,000 y \$10,000 = \$10,000

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### 3. Quantity Theory of Money

Velocityand the Quantity Equation

y Definition of quantity equation: the equation M × V = P × Y, which relates the quantity of money (M), the velocity of money (V), and the dollar value of the economy’s output of goods and services (PY).

y The quantity equation shows that an increase in the quantity of money (M) must be reflected in one of the other three variables.

y Specifically, the price level (P) must rise, output (Y) must rise, or velocity (V) must fall.

y Figure 3 shows nominal GDP, the quantity of money (as measured by M2) and the velocity of money for the United States since 1960. It appears that velocity is fairly stable, while GDP and the money supply have grown dramatically.

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Nominal GDP, the Quantity of Money, and the Velocity of Money

Indexes (1960 = 100) 2,000

1,000

500

0 1,500

1960 1965 1970 1975 1980 1985 1990 1995 2000 Nominal GDP

Velocity M2

Velocity is fairly stable

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### 3. Quantity Theory of Money

Velocity and the Quantity Equation

y We can now explain how an increase in the quantity of money affects the price levelusing the quantity equation.

y The velocity of money is relatively stable over time.

y When the central bank changes the quantity of money (M), it will proportionately change the nominal value of output (P × Y).

y The economy’s output of goods and services (Y) is determined primarily by available resources and technology. Because money is neutral, changes in the money supply do not affect output. This must mean that P increases proportionately with the P increases proportionately with the change in

change in MM. . y

y Monetary neutrality is a longMonetary neutrality is a long--run view. Money supply can affect the real run view. Money supply can affect the real sector (real output) through transmission mechanism (i.e. the im sector (real output) through transmission mechanism (i.e. the impact of pact of interest rates on consumption and investment).

interest rates on consumption and investment). (See slide 30)(See slide 30)

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## References

y Mankiw, N G (2007), Principles of Economics, 4th edition, Thomson, South-Western, Chapter 33 & 34.

y Mankiw, N.G. (2007), Macroeconomics, 6th ed. Worth Publishers, Chapter 18.

y Mishkin, F. S. (2010), The Economics of Money, Banking and Financial Markets, 9thEdition, Pearson, Chapter 19.

y Parkin, M. (2010), Economics, 9thEdition, Pearson, Chapter 25.

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## References

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