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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
PowerPoint Lectures for
Principles of Economics,
9e
; ;
By
Karl E. Case,
Ray C. Fair &
Sharon M. Oster
© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster
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PART V THE CORE OF MACROECONOMIC THEORY
27
Aggregate Demand
in the Goods and
Money Markets
Prepared by:
Fernando & Yvonn Quijano
© 2009 Pearson Education, Inc. Publishing as Prentice Hall Principles of Economics 9e by Case, Fair and Oster
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
PART V THE CORE OF MACROECONOMIC THEORY
Aggregate Demand
in the Goods and
Money Markets
27
11
CHAPTER OUTLINE
Planned Investment and the Interest Rate
Other Determinants of Planned Investment
Planned Aggregate Expenditure and the
Interest Rate
Equilibrium in Both the Goods and Money
Markets
Policy Effects in the Goods and Money
Markets
Expansionary Policy Effects
Contractionary Policy Effects
The Macroeconomic Policy Mix
The Aggregate Demand (AD) Curve
The Aggregate Demand Curve: A Warning
Other Reasons for a Downward-Sloping
Aggregate Demand Curve
Aggregate Expenditure and Aggregate Demand
Shifts of the Aggregate Demand Curve
Looking Ahead: Determining the Price
Level
Appendix: The IS-LM Diagram
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Aggregate Demand in the Goods and Money Markets
goods market The market in which goods and
services are exchanged and in which the
equilibrium level of aggregate output is
determined.
money market The market in which financial
instruments are exchanged and in which the
equilibrium level of the interest rate is determined.
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Planned Investment and the Interest Rate
 FIGURE 27.1 Planned Investment Schedule
Planned investment spending is a negative function of the interest rate.
An increase in the interest rate from 3 percent to 6 percent reduces planned investment from I0 to I1.
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Other Determinants of Planned Investment
The assumption that planned investment depends
only on the interest rate is obviously a
simplification, just as is the assumption that
consumption depends only on income. In practice,
the decision of a firm on how much to invest
depends on, among other things, its expectation of
future sales.
The optimism or pessimism of entrepreneurs
about the future course of the economy can have
an important effect on current planned investment.
Keynes used the phrase animal spirits to describe
the feelings of entrepreneurs, and he argued that
these feelings affect investment decisions.
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Other Determinants of Planned Investment
Interest Rates and
Investment Spending
A recent study by Simon
Gilchrist, Fabio Natalucci,
and Egon Zakrajsek finds
that interest rates have a
powerful effect on the
behavior of firms.
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Planned Aggregate Expenditure and the Interest Rate
We can use the fact that planned investment
depends on the interest rate to consider how
planned aggregate expenditure (AE) depends on
the interest rate.
Recall that planned aggregate expenditure is the
sum of consumption, planned investment, and
government purchases.
AE ≡ C + I + G
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Planned Aggregate Expenditure and the Interest Rate
 FIGURE 27.2 The Effect of an Interest Rate Increase on Planned Aggregate Expenditure
An increase in the interest rate from 3 percent to 6 percent lowers planned aggregate
expenditure and thus reduces equilibrium income from Y0 to Y1.
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Planned Aggregate Expenditure and the Interest Rate
The effects of a change in the interest rate include:
 A high interest rate (r) discourages planned
investment (I).
 Planned investment is a part of planned
aggregate expenditure (AE).
 Thus, when the interest rate rises, planned
aggregate expenditure (AE) at every level of
income falls.
 Finally, a decrease in planned aggregate
expenditure lowers equilibrium output (income)
(Y) by a multiple of the initial decrease in
planned investment.
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Planned Investment and the Interest Rate
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Planned Aggregate Expenditure and the Interest Rate
Using a convenient shorthand:
r  I  AE  Y 
r  I  AE  Y 
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Equilibrium in Both the Goods and Money Markets
An increase in the interest rate (r) decreases output
(Y) in the goods market because an increase in r
lowers planned investment.
When income (Y) increase, this shifts the money
demand curve to the right, which increases the
interest rate (r) with a fixed money supply. We can
thus write:
Y  M d  r 
Y  M  r 
d
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Equilibrium in Both the Goods and Money Markets
 FIGURE 27.3 Links Between the Goods Market and the Money Market
Planned investment depends on the interest rate, and money demand depends on aggregate output.
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Expansionary Policy Effects
expansionary fiscal policy An increase in
government spending or a reduction in net taxes
aimed at increasing aggregate output (income)
(Y).
expansionary monetary policy An increase in
the money supply aimed at increasing aggregate
output (income) (Y).
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Expansionary Policy Effects
Expansionary Fiscal Policy: An Increase in Government
Purchases (G) or a Decrease in Net Taxes (T)
crowding-out effect The tendency for increases
in government spending to cause reductions in
private investment spending.
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Expansionary Policy Effects
Expansionary Fiscal Policy: An Increase in Government
Purchases (G) or a Decrease in Net Taxes (T)
 FIGURE 27.4 The
Crowding-Out Effect
An increase in government
spending G from G0 to G1
shifts the planned aggregate
expenditure schedule from 1
to 2.
The crowding-out effect of the
decrease in planned
investment (brought about by
the increased interest rate)
then shifts the planned
aggregate expenditure
schedule from 2 to 3.
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Expansionary Policy Effects
Expansionary Fiscal Policy: An Increase in Government
Purchases (G) or a Decrease in Net Taxes (T)
interest sensitivity or insensitivity of planned
investment The responsiveness of planned
investment spending to changes in the interest
rate. Interest sensitivity means that planned
investment spending changes a great deal in
response to changes in the interest rate; interest
insensitivity means little or no change in planned
investment as a result of changes in the interest
rate.
Effects of an expansionary fiscal policy:
G  Y  M d  r  I 
Y increasesless than if r did not increase
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Expansionary Policy Effects
Expansionary Monetary Policy: An Increase in the
Money Supply
Effects of an expansionary monetary policy:
M s  r  I  Y  M d 
r decreasesless than if M
d
did not increase
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Contractionary Policy Effects
Contractionary Fiscal Policy: A Decrease in Government
Spending (G) or an Increase in Net Taxes (T)
contractionary fiscal policy A decrease in
government spending or an increase in net taxes
aimed at decreasing aggregate output (income)
(Y).
Effects of a contractionary fiscal policy:
G  or T  Y  M d  r  I 
Y decreasesless than if r did not decrease
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Contractionary Policy Effects
Contractionary Monetary Policy: A Decrease in the
Money Supply
contractionary monetary policy A decrease in
the money supply aimed at decreasing aggregate
output (income) (Y).
Effects of a contractionary monetary policy:
M s  r  I  Y  M d 
r increasesless than if M
d
did not decrease
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Policy Effects in the Goods and Money Markets
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
The Macroeconomic Policy Mix
policy mix The combination of monetary and
fiscal policies in use at a given time.
TABLE 27.1 The Effects of the Macroeconomic Policy Mix
Fiscal Policy
Expansionary
Contractionary
( G or  T )
( G or  T )
Expansionary
( M s )
Y , r ?, I ?, C 
Y ?, r , I , C ?
Contractionary
( M s )
Y ?, r , I , C ?
Y , r ?, I ?, C 
Monetary
Policy
Key :
: Variable increases.
: Variable decreases.
? : Forces push the variable in different directions . Without additional informatio n, we cannot
specify which way the variable moves.
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
The Aggregate Demand (AD) Curve
aggregate demand The total demand for goods
and services in the economy.
aggregate demand (AD) curve A curve that
shows the negative relationship between
aggregate output (income) and the price level.
Each point on the AD curve is a point at which
both the goods market and the money market are
in equilibrium.
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
The Aggregate Demand (AD) Curve
 FIGURE 27.5 The Impact of an Increase in the Price Level on the Economy—Assuming No
Changes in G, T, and Ms
This figure shows that when P increases, Y decreases.
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
The Aggregate Demand (AD) Curve
 FIGURE 27.6 The Aggregate
Demand (AD) Curve
At all points along the AD curve, both
the goods market and the money
market are in equilibrium. The policy
variables G, T, and Ms are fixed.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
The Aggregate Demand Curve: A Warning
It is important that you realize what the aggregate
demand curve represents.
The aggregate demand curve is more complex
than a simple individual or market demand curve.
The AD curve is not a market demand curve, and
it is not the sum of all market demand curves in
the economy.
To understand what the aggregate demand curve
represents, you must understand the interaction
between the goods market and the money
markets.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Other Reasons for a Downward-Sloping Aggregate Demand Curve
The Consumption Link
The consumption link provides another reason for
the AD curve’s downward slope.
An increase in the price level increases the
demand for money, which leads to an increase in
the interest rate, which leads to a decrease in
consumption (as well as planned investment),
which leads to a decrease in aggregate output
(income).
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Other Reasons for a Downward-Sloping Aggregate Demand Curve
The Consumption Link
The initial decrease in consumption (brought about
by the increase in the interest rate) contributes to
the overall decrease in output.
Planned investment does not bear all the burden
of providing the link from a higher interest rate to a
lower level of aggregate output.
Decreased consumption brought about by a higher
interest rate also contributes to this effect.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Other Reasons for a Downward-Sloping Aggregate Demand Curve
The Real Wealth Effect
real wealth, or real balance, effect The change
in consumption brought about by a change in real
wealth that results from a change in the price level.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Aggregate Expenditure and Aggregate Demand
At equilibrium, planned aggregate expenditure
(AE ≡ C + I + G) and aggregate output (Y) are
equal:
equilibrium condition: C + I + G = Y
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Shifts of the Aggregate Demand Curve
 FIGURE 27.7 The Effect of an
Increase in Money Supply on the AD
Curve
An increase in the money supply (Ms)
causes the aggregate demand curve to
shift to the right, from AD0 to AD1. This
shift occurs because the increase in
Ms lowers the interest rate, which
increases planned investment (and
thus planned aggregate expenditure).
The final result is an increase in output
at each possible price level.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Shifts of the Aggregate Demand Curve
 FIGURE 27.8 The Effect of an
Increase in Government Purchases or a
Decrease in Net Taxes on the AD Curve
An increase in government purchases
(G) or a decrease in net taxes (T)
causes the aggregate demand curve to
shift to the right, from AD0 to AD1. The
increase in G increases planned
aggregate expenditure, which leads to
an increase in output at each possible
price level. A decrease in T causes
consumption to rise. The higher
consumption then increases planned
aggregate expenditure, which leads to
an increase in output at each possible
price level.
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The Aggregate Demand (AD) Curve
CHAPTER 27 Aggregate Demand in the Goods and Money Markets
Shifts of the Aggregate Demand Curve
 FIGURE 27.9 Factors That Shift the Aggregate Demand Curve
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CHAPTER 27 Aggregate Demand in the Goods and Money Markets
REVIEW TERMS AND CONCEPTS
aggregate demand
aggregate demand (AD) curve
contractionary fiscal policy
contractionary monetary policy
crowding-out effect
expansionary fiscal policy
expansionary monetary policy
goods market
interest sensitivity or insensitivity of planned
investment
money market
policy mix
real wealth, or real balance, effect
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