1. The Influence of Monetary and Fiscal Policy on Aggregate Demand
Chapter 20
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2. Aggregate Demand
Desired spending by households and business firms determines the overall demand for goods and services.
For the U.S. economy, the most important reason for the downward slope of the aggregate-demand curve is the interest-rate effect. 2

3. When desired spending changes, aggregate demand shifts, causing short-run fluctuations in output and employment.
Monetary and fiscal policy are sometimes used to offset those shifts and stabilize the economy.

4. Monetary Policy
The setting of the money supply by the FOMC to change the interest rate, influence AD, the level of RGDP and the inflation rate.

5. Money Supply The money supply is controlled by the Fed through:
Open-market operations
Changing the reserve requirements
Changing the discount rate
The effect of changes in the money supply on interest rates and money demand can be illustrated using the Money Market model

6. Equilibrium in the Money Market...
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Equilibrium in the Money Market...
Interest
Rate
Quantity fixed
by the Fed
Money
supply
Money
demand r1 M
d 1
Equilibrium interest rate r2 M
d 2
Quantity of
Money 18

7. Money Supply
Because it is fixed by the Fed, the quantity of money supplied does not depend on the interest rate.
The fixed money supply is represented by a vertical supply curve. 7

8. Money Demand Money demand has two features:
Asset demand: People choose to hold money instead of other assets that offer higher rates of return because money can be used to buy goods and services.
Asset demand is determined by the current interest rate. 12

9. Money Demand
The opportunity cost of holding money is the interest that could be earned on interest-earning assets.
An increase in the interest rate raises the opportunity cost of holding money.
As a result, the quantity of money demanded is reduced. 12

10. Money Demand Transaction demand
Determined by nominal GDP; the more that is produced or the more things cost the more money we need to spend and vice versa.
A change in nominal GDP causes a shift of the money demand curve

11. Changes in the Money Supply
The Fed can shift the aggregate demand curve when it changes monetary policy.
An increase in the money supply shifts the money supply curve to the right.
Without a change in the money demand curve, the interest rate falls.
Falling interest rates increase the quantity of goods and services demanded. 23

12. Cause-Effect Chain Money supply impacts interest rates
MONETARY POLICY, REAL GDP
AND THE PRICE LEVEL
Cause-Effect Chain
Money supply impacts interest rates
Interest rates affect investment
Investment is a component of AD
Equilibrium GDP is changed

13. AD2 AD1 If the money supply increases to stimulate the economy...
MONETARY POLICY AND EQUILIBRIUM GDP
Sm1
Sm2
Investment
Demand 10 8 6 10 8 6
Real rate of interest, i Dm
Quantity of money demanded and supplied
Amount of investment, I
If the money
supply increases
to stimulate the
economy... AS
Money Supply Increases
Interest Rate Decreases
Price level
Investment Increases P2 P1
AD & GDP Increases
with slight inflation
AD1
AD2
Real domestic output, GDP

14. AD1 AD2 MONETARY POLICY AND EQUILIBRIUM GDP Sm2 Sm1 Dm
Investment
Demand 10 8 6 10 8 6
Nominal rate of interest, i
If the money
supply decreases Dm
Quantity of money demanded and supplied
Amount of investment, I AS
Less Money Supply P1
Higher Interest Rates
Price level
Less Investment P2
Lower AD & GDP
with some unemployment
AD1
AD2
Real domestic output, GDP

15. The Role of Interest-Rate Targets in Fed Policy
Monetary policy can be described either in terms of the money supply or in terms of the interest rate.
Changes in monetary policy can be viewed either in terms of a changing target for the interest rate or in terms of a change in the money supply.
A target for the federal funds rate affects the money market equilibrium, which influences aggregate demand. 28

16. How Fiscal Policy Influences Aggregate Demand
Fiscal policy refers to the government’s choices regarding the overall level of government purchases or taxes.
Fiscal policy influences saving, investment, and growth in the long run.
In the short run, fiscal policy primarily affects the aggregate demand. 30

17. Changes in Government Purchases
When policymakers change the money supply or taxes, the effect on aggregate demand is indirect – through the spending decisions of firms or households.
When the government alters its own purchases of goods or services, it shifts the aggregate-demand curve directly. 31

18. Changes in Government Purchases
There are two macroeconomic effects from the change in government purchases:
The multiplier effect
The crowding-out effect 33

19. The Multiplier Effect
Government purchases are said to have a multiplier effect on aggregate demand.
Each dollar spent by the government can raise the aggregate demand for goods and services by more than a dollar. 34

20. The Multiplier Effect... Price Level
AD3
2. …but the multiplier effect can amplify the shift in aggregate demand.
AD2
1. An increase in government purchases of $20 billion initially increases aggregate demand by $20 billion…
$20 billion
Aggregate demand, AD1
Quantity
of Output 34

21. A Formula for the Spending Multiplier
The formula for the multiplier is:
Multiplier = 1/(1 - MPC)
An important number in this formula is the marginal propensity to consume (MPC).
It is the fraction of extra income that a household consumes rather than saves. 38

22. A Formula for the Spending Multiplier
If the MPC is 3/4, then the multiplier will be:
Multiplier = 1/(1 - 3/4) = 4
In this case, a $20 billion increase in government spending generates $80 billion of increased demand for goods and services. 38

23. The Crowding-Out Effect
Fiscal policy may not affect the economy as strongly as predicted by the multiplier.
An increase in government purchases causes the interest rate to rise.
A higher interest rate reduces investment spending. 39

24. The Crowding-Out Effect
This reduction in demand that results when a fiscal expansion raises the interest rate is called the crowding-out effect.
The crowding-out effect tends to dampen the effects of fiscal policy on aggregate demand. 39

25. The Crowding-Out Effect...
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(a) The Money Market
(b) The Shift in Aggregate Demand
Interest Rate
AD3
4. …which in turn partly offsets the initial increase in aggregate demand.
Price Level
1. When an increase in government purchases increases aggregate demand…
AD2
$20 billion
Money supply
MD2
2. …the increase in spending increases money demand…
3. …which increases the equilibrium interest rate… r2 r1
Money demand, MD1
Aggregate demand, AD1
Quantity of Money
Quantity of Output
Quantity fixed by the Fed 39

26. The Crowding-Out Effect
When the government increases its purchases by $20 billion, the aggregate demand for goods and services could rise by more or less than $20 billion, depending on whether the multiplier effect or the crowding-out effect is larger. 39

27. Changes in Taxes
When the government cuts personal income taxes, it increases households’ take-home pay.
Households save some of this additional income.
Households also spend some of it on consumer goods.
Increased household spending shifts the aggregate-demand curve to the right. 40

28. Changes in Taxes
The size of the shift in aggregate demand resulting from a tax change is affected by the multiplier and crowding-out effects.
It is also determined by the households’ perceptions about the permanency of the tax change. 41

29. Using Policy to Stabilize the Economy
Economic stabilization has been an explicit goal of U.S. policy since the Employment Act of 1946. 41

30. The Case for Active Stabilization Policy
The Employment Act has two implications:
The government should avoid being the cause of economic fluctuations.
The government should respond to changes in the private economy in order to stabilize aggregate demand. 42

31. The Case Against Active Stabilization Policy
Some economists argue that monetary and fiscal policy destabilizes the economy.
Monetary and fiscal policy affect the economy with a substantial lag.
They suggest the economy should be left to deal with the short-run fluctuations on its own. 42

32. Automatic Stabilizers
Automatic stabilizers are changes in fiscal policy that stimulate aggregate demand when the economy goes into a recession without policymakers having to take any deliberate action.
Automatic stabilizers include the tax system and some forms of government spending. 45

33. Summary
Keynes proposed the theory of liquidity preference to explain determinants of the interest rate.
According to this theory, the interest rate adjusts to balance the supply and demand for money.

34. Summary
An increase in the price level raises money demand and increases the interest rate.
A higher interest rate reduces investment and, thereby, the quantity of goods and services demanded.
The downward-sloping aggregate-demand curve expresses this negative relationship between the price-level and the quantity demanded.

35. Summary
Policymakers can influence aggregate demand with monetary policy.
An increase in the money supply will ultimately lead to the aggregate-demand curve shifting to the right.
A decrease in the money supply will ultimately lead to the aggregate-demand curve shifting to the left.

36. Summary
Policymakers can influence aggregate demand with fiscal policy.
An increase in government purchases or a cut in taxes shifts the aggregate-demand curve to the right.
A decrease in government purchases or an increase in taxes shifts the aggregate-demand curve to the left.

37. Summary
When the government alters spending or taxes, the resulting shift in aggregate demand can be larger or smaller than the fiscal change.
The multiplier effect tends to amplify the effects of fiscal policy on aggregate demand.
The crowding-out effect tends to dampen the effects of fiscal policy on aggregate demand.

38. Summary
Because monetary and fiscal policy can influence aggregate demand, the government sometimes uses these policy instruments in an attempt to stabilize the economy.
Economists disagree about how active the government should be in this effort.
Policy advocates say that if the government does not respond the result will be undesirable fluctuations.
Critics argue that attempts at stabilization often turn out destabilizing.

39. Graphical Review

40. Equilibrium in the Money Market...
Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc.
Equilibrium in the Money Market...
Quantity of
Money
Interest
Rate
demand
Quantity fixed
by the Fed
supply r2 M
d 2 r1
d 1
Equilibrium interest rate 18

41. Quantity fixed by the Fed
The Money Market and the Slope of the Aggregate Demand Curve...
Aggregate demand
(b) The Aggregate Demand Curve
Quantity
of Output
Price Level
(a) The Money Market
Quantity of Money
Quantity fixed by the Fed r1
Money supply
Interest Rate
Money demand at price level P1, MD1 Y1 P1
Money demand at
price level P2, MD2
2. …increases the demand for money…
1. An increase in the price level… P2
3. …which increases the equilibrium equilibrium rate… r2
4. …which in turn reduces the quantity of goods and services demanded. Y2

42. 2. …the equilibrium interest rate falls…
Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc.
A Monetary Injection...
1. When the Fed increases the money supply…
MS2 Y1 P
Quantity
of Output
Price Level
Aggregate demand, AD1
(a) The Money Market
of Money
Money supply, MS1 r1
Interest Rate
(b) The Aggregate-Demand Curve r2
2. …the equilibrium interest rate falls… Y2
AD2
3. …which increases the quantity of goods and services demanded at a given price level. 25

43. The Multiplier Effect... Price Level
Aggregate demand, AD1
Quantity
of Output
Price
Level
AD2
1. An increase in government purchases of $20 billion initially increases aggregate demand by $20 billion…
$20 billion
AD3
2. …but the multiplier effect can amplify the shift in aggregate demand. 34

44. The Crowding-Out Effect...
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AD3
4. …which in turn partly offsets the initial increase in aggregate demand.
Aggregate demand, AD1
(b) The Shift in Aggregate Demand
Quantity of Output
Price Level
(a) The Money Market
Quantity of Money
Quantity fixed by the Fed r1
Money demand, MD1
Money supply
Interest Rate
1. When an increase in government purchases increases aggregate demand…
AD2
$20 billion
3. …which increases the equilibrium interest rate… r2
MD2
2. …the increase in spending increases money demand… 39