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EC140 Lecture Notes - Lecture 10: Aggregate Demand, Aggregate Supply, Diminishing Returns

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School
WLU
Department
Economics
Course
EC140
Professor
Ken Jackson

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EC140 Full Course Notes
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EC140 Full Course Notes
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Document Summary

What happens if prices rise: the money that people hold can buy fewer goods, people are poorer which means consumption falls. What happens if prices fall: value of money held goes up, consumption therefore rises. Ad curve shows level of real gdp for each price level where desired aggregate expenditure equals actual gdp: equilibrium output from the simple macro model for each price level. Changes in price level cause: shifts of the ae curve, movements along the ad curve. As price rise: people are poorer and consumption falls, exports fall, foreign goods are cheaper and imports rise. All three changes mean that price rise causes real gdp to fall: move up and left along the ad curve. Ad increases and the ad curve shifts right if ae shifts up: increase in income in export markets, increase in business optimism, increase in government spending. Real gdp increases as ae shifts up. Shift derived from simple multiplier = 1/1-z.

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Related Questions

1. Explain how the real balance effect works?

2. How will either the AD curve or SRAS curve shift as a result of each of the following changes:

A rise in the interest rate

An adverse supply shock

A rise in wealth

3. Explain what happens to U.S. net exports and U.S. aggregate demand as the dollar depreciates

4. Explain what happens to aggregate demand in each of the following cases: (a) The interest rate rises; (b) Wealth falls; (c) The dollar depreciates relative to foreign currencies; (d) Households expect lower prices in the future; (e) Business taxes rise.

5. Explain how expectations about future sales will affect investment.

6. Explain how each of the following can affect short-run aggregate supply: (a) An increase in wage rates; (b) A beneficial supply shock; (c) An increase in the productivity of labor; (d) A decrease in the price of a nonlabor resource (such as oil).

(a) An increase in SRAS that is greater than the increase in AD will lead to an increase in Real GDP and a fall in the price level.

(b) A decrease in AD that is greater than the increase in SRAS will lead to a fall in both the Real GDP and the price level.

(c) An increase in SRAS that is less than the increase in AD will lead to an increase in both the

1. Which of the following shifts aggregate demand to the right?
a. Congress reduces purchases of new weapons systems.
b. US exports increase.
c. The price level falls
d. New developments in IT increase the productivity of most manufacturing industries in the US.

2. Suppose the EPA introduces new smog regulation that makes it costlier to produce cars. As a result, aggregate supply falls (primary effect) and firms cut back on production. With less output in the economy available for consumers, consumers bid up the prices of available output. With higher prices, firms choose to produce more (secondary effect).
Which of the following best explains what the net effect on GDP?
a. The two effects should essentially cancel out, with little to no effect on GDP, but the price level clearly rises.
b. It is impossible to say what happens to GDP without being able to compare the magnitudes of the two effects.
c. Real GDP rises as the secondary effect dominates the primary effect.
d. Real GDP falls since the primary effect dominates the secondary effect.

3. A Keynesian economist who observes an output gap would conclude that
a. aggregate demand should be shifted to the right.
b. a policy of deregulation would be better than demand management policy
c. aggregate supply should be shifted to the right
d. All proposed answer options are correct

4. Monetarists believe
a. the Aggregate Supply curve is upward-sloping (but not vertical) over all time frames.
b. the Aggregate Supply curve can be treated as horizontal in the long run (over 10 years
c. the Aggregate Supply curve is vertical only in the very long run (over 20 years).
d. the Aggregate Supply curve can be treated as vertical in the short-to-medium run (1-2 years)

5. Suppose the price of oil increases due to conflict in the Middle East. How will this be illustrated in the AD-AS model?
a. The aggregate demand curve will shift to the left
b. The aggregate supply curve will shift to the left.
c. The aggregate demand curve will shift to the right
d. The aggregate supply curve will shift to the right

6. Assume a Keynesian AS curve. In the short run, when there is a large output gap
a. contractionary demand management policy is likely to be highly inflationary
b. expansionary demand management policy does not cause much inflation.
c. expansionary demand management policy is likely to be highly inflationary
d. the government should use contractionary demand management policy

7. As a result of Bush tax cuts that partially expired in January 2013, the marginal tax rates for some households increased and these households paid higher taxes. Which of the following would be the best description of the tax cut expiration?
a. Rightward shift in AS
b. Rightward shift in AD
c. Leftward shift in AD
d. Leftward shift in AS

8. Suppose that the U.S. government increases income taxes on individuals earning more than $500,000/year and uses the revenue from this tax increase to subsidize the cost of energy for businesses. How will this policy change affect the U.S. economy?
a. The effect on output is ambiguous but price level will decrease for sure
b. The effect on both output and price level is ambiguous.
c. The effect on price level is ambiguous but output will increase for sure
d. The effect on price level is ambiguous but output will decrease for sure

9. If Australia, which imports goods from the United States, went into recession, we would expect that U.S. net exports would
a. rise, making aggregate demand shift right.
b. rise, making aggregate demand shift left
c. fall, making aggregate demand shift left
d. fall, making aggregate demand shift right

10. Suppose that Greece decides to exit the European Union and the Euro Zone, causing a boost in business confidence in European markets. How would you illustrate the primary effect of Greece’s decision in the AD-AS model for the EU economy?

Note: for this question, assume that Y in the AD-AS model represents output (GDP) of EU member countries without Greece.
a. a shift in the aggregate supply curve to the left and a shift in the aggregate demand curve to the left
b. a shift in the aggregate demand curve to the right
c. a shift in the aggregate demand curve to the left
d. movement along the aggregate demand curve to the left

11. The Austrian school of thought believes that demand management policy should not be used because
a. big government prefers deregulation, which shifts aggregate supply
b. the economy is always at full employment
c. shifting AD to the right is likely to cause deflation
d. big government has a bias towards inflationary policy

1.

In the money market, money supply is determined by the central bank, such as the Fed in the U.S. Because of this, money supply curve is usually vertical in the short run, while the money demand curve is downward sloping. The quantity demanded of money has an inverse relationship with the interest rate, but a direct relationship with both the price level and real GDP. Therefore, when the general price level increases, what will most likely happen?

A. The money demand curve will shift to the right.

B. The money demand curve will shift to the left.

C. Both the interest rate and investment will rise.

D. Only A and C.

E. Only B and C.

3.

Suppose workers become pessimistic about their future employment, which causes them to save more and spend less. If the economy is in the Keynesian range of the aggregate supply curve, then

A. real GDP will fall and the price level will rise.

B. real GDP will rise and the price level will fall.

C. only the real GDP will fall.

D. only the price level will fall.

E. both real GDP and the price level will fall.

5.

Which of the following will shift the aggregate demand curve to the left?

A. The federal government increases spending for highways and bridges.

B. Consumers expect an economic downturn.

C. The federal government increases income taxes.

D. Only A and C.

E. Only B and C.

6.

Which of the following will shift the aggregate supply curve to the left?

A. All workers agree to a reduction in wages.

B. The federal government increases the gasoline taxes.

C. An improvement in technology raises labor productivity.

D. Only A and C.

E. Only B and C

8.

There are also two kinds of deflation, the demand-pull deflation and cost-push deflation. Then which of the following is most likely to be true?

A. An increase in AD will cause the demand-pull deflation.

B. An increase in AS (or SRAS) will cause a cost-push deflation.

C. Economists worry about the demand-pull deflation more than the cost-push deflation.

D. Only A and C.

E. Only B and C.

9.

The short-run aggregate supply curve (SRAS) can be written as follows: Y = Yf + b (p - pe), where Y = real GDP, Yf = full-employment real GDP, p = price level, pe = expected price level, and b is a positive coefficient. The SRAS can be re-written as p = pe - (1/b)(Yf) + (1/b)(Y). Then which of the following is true?

A. An increase in pe will cause a rightward shift of the SRAS curve.

B. An increase in pe will cause a leftward shift of the SRAS curve.

C. An increase in Yf will cause a leftward shift of the SRAS curve.

D. Only A and C.

E. Only B and C.