ECON 1P92 Lecture Notes - Lecture 11: Aggregate Supply, Aggregate Demand

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16 Mar 2018

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ECON 1P92 Full Course Notes

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Econ 1p92 - lecture 11 notes: ch 23: output and prices in the short run. Change in autonomous expenditures i, g, x. Increase in p reduces the real value of money. Fall in p raises the real value of money holdings. Changes in wealth affect consumption [ c ]: Prices rise in canada - foreign prices are constant: Conversely for a fall in canada"s prices. Relates equilibrium real gdp to the price level. For any given price level, ad curve shows level of real gdp where desired aggregate expenditure equals actual gdp (y) Main reason: real wealth increases when p falls [ real balances effect] Any positive shock [ increase in exports ( x ) ] , increases equilibrium gdp. Any negative shock [ fall in investment ( i ) ] Decreases ad - shifts the ad leftward. K x da measures size of horizontal shift of ad curve. The ae line shifts up or down.

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1. According to the Solow model, an increase in the capital-labor ratio will a. always increase steady state consumption per worker b. reduce steady state consumption per worker if the capital-labor ratio is below the Golden rule capital stock c. always reduce steady state consumption per worker d. increase steady state consumption per worker if the capital-labor ratio is below the Golden rule capital stock

2. In a steady state a. capital and labor, by definition, are inversely related to one another b. both consumption per worker and the capital-labor ratio are constant c. consumption per worker can change, but the capital-labor ratio is constant d. consumption per worker is constant, but the capital-labor ratio can change

3. Which of the following changes would lead, according to the Solow model, to a higher level of long-run output per worker? a. An increase in the saving rate b. A lower level of capital per worker c. A decrease in productivity d. A rise in the rate of population growth

4. In the long run, a reduction in productivity will cause a. an increase in the capital-labor ratio and a decrease in consumption per worker b. a decrease in the capital-labor ratio and a decrease in consumption per worker c. a decrease in the capital-labor ratio and an increase in consumption per worker d. an increase in the capital-labor ratio and an increase in consumption per worker

5. An increase in the growth rate of population in a steady-state economy would cause a. a pivot down and to the right in the investment line b. a parallel shift downward in the investment line c. a pivot up and to the left in the investment line d. a parallel shift upward in the investment line 1 2

6. In the efficiency wage model, an increase in productivity would a. have no effect on either output or the real wage b. increase output but have no effect on the real wage c. decrease the real wage but have no effect on output d. increase output but decrease the real wage

7. Keynesian economists believe that in the short run, a. money neutrality does not exist and prices adjust rapidly b. money neutrality does not exist and prices do not adjust rapidly c. money neutrality exists and prices adjust rapidly d. money neutrality exists and prices do not adjust rapidly

8. If the expected inflation rate is unchanged, a fall in the natural rate of unemployment would a. not shift the Phillips curve b. shift the Phillips curve to the left c. shift the Phillips curve to the right d. shift the Phillips curve to the left and shift the long-run Phillips curve to the right

9. Classical economists believe that in the short run, a. money neutrality does not exist and prices adjust rapidly b. money neutrality does not exist and prices do not adjust rapidly c. money neutrality exists and prices do not adjust rapidly d. money neutrality exists and prices adjust rapidly

10. The fact that the long-run Phillips curve is vertical implies that a. money canât affect inflation in the long run b. money is neutral in the long run c. monetary policy canât affect unemployment d. there is a natural rate of inflation

1. Briefly explain the shape of the per-worker production curve in the Solow model. If investment per worker initially exceeds saving per worker, how is the steady state capital-labor ratio achieved?

2. Describe the effects of a rise in the domestic real interest rate on the exchange rate and on both domestic and foreign net exports.

3. For each of the following changes, what happens to the real interest rate and output in the short run, before the price level has adjusted to restore general equilibrium? a. Wealth declines b. Money supply declines c. The future marginal productivity of capital declines d. Expected inflation rises e. Future income rises

MBA502, Economics for Business

Apply and Discover 7.2

You are responsible for economic policymaking in your country. Your desire is to eliminate inflation, keeping prices absolutely stable at P = 100, no matter what happens to output. Currently, the economy is in equilibrium at Q = 3200 (where Q = potential GDP) and P = 100. You can use monetary and fiscal policies to affect aggregate demand but you cannot affect aggregate supply in the short run. How would you respond to the following scenarios?

Explain and illustrate how each of these events would affect aggregate demand, aggregate supply, and prices, then explain how you would respond with economic policies.

1. A surprise increase in investment spending

In the short run, when investment spending increases, it results in an increase in Aggregate Demand (AD), which in turn pushes up both GPD and the price index.

To counterbalance this development, government might pursue contractionary fiscal policy by increasing taxes (to reduce consumption) or decreasing its own investment and spending so that the AD curve shifts back to its original position. Alternatively, the government can pursue contractionary monetary policy by reducing money supply and increasing interest rate to discourage economic activity.

2. Catastrophic floods that cause a sharp food price increase

In this case, sharp food shortages and consequent price increases cause a shock-type adjustment of the aggregate supply curve (it shift up and to the left). The result is a lower GDP and a higher price level.

The government cannot do anything to adjust AS in the short run. However, if the goal is to maintain the price level constant, the government can decide to do something to decrease the aggregate demand to force prices to come down, though it will be accompanies by another contraction in GDP and so it would not be a smart thing to do.

To cause AD to decrease, the government, similar to example above, can pursue fiscal policy (increase taxes, decrease spending) or monetary policy (reduce supply of money to the economy and thus increase interest rates).

3. A productivity decline that reduces potential output

In this case, AS shifts to the left, as was the case in example 2. As a result, price levels go up, as the same amount of money is chasing the reduced amount of goods and services, and GDP declines.

Government remedies here would be centered about causing AD to decrease through contractionary fiscal (higher taxes, lower spending) or monetary (reduce money supply and increase interest rates) policy. Again, this decision reduces inflation but at expense of GDP, as real output shrinks further.

4. A deep depression in East Asia that causes a sharp decrease in net exports to the United States

A decrease in exports of goods to from the United States to Asia will mean that the aggregate demand (which includes net exports

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When demand for a good is very elastic, revenue ________ when the price falls.

(2)

An elasticity measure less than one means that demand is __________.

(3)

An elasticity measure greater than one means that demand is __________.

(4)

The Latin expression ceteris paribus means

	having made all other necessary changes.
	holding constant all other variables.
	assuming all households have similar incomes.
	given the level of income in the economy.

(5)

A variable measured in terms of money is called a ____________________.

	real variable
	nominal variable
	macroeconomic variable
	microeconomic variable

(6)

Which of the following is true about the importance of money in economics?

	Money is important in both macroeconomics and microeconomics.
	Money is important in macroeconomics but not microeconomics.
	Money is important in microeconomics but not macroeconomics.
	Money is not important in either microeconomics or macroeconomics.

(7)

What is the difference between normative and positive economics?

	Positive economics is descriptive and predictive; normative economics is prescriptive.
	Positive economics highlights the positive aspects of the economy; normative economics highlights the average features.
	Positive economics studies the actions of individuals; normative economics studies the actions of households.
	Positive economics is an applied social science; normative economics is a theoretical social science.

(8)

The slope of the demand curve is negative because

	the quantity of a good demanded decreases as income declines.
	the quantity of a good demanded increases as income declines.
	the quantity of a good demanded increases as the price declines.
	the quantity of a good demanded decreases as the price declines.

(9)

What is the result of an increase in the price of bread, a normal good?

	The demand curve shifts to the right.
	The demand curve shifts to the left.
	The quantity demanded increases.
	The quantity demanded decreases.

(10)

What is the effect on demand for bread when the price of bagels, a substitute for bread, rises?

	The demand curve for bread shifts to the right.
	The demand curve for bread shifts to the left.
	The quantity of bread demanded increases.
	The quantity of bread demanded decreases.

(11)

Which of the following would cause the supply curve for bread to shift inward?

	An increase in the price of bread
	An increase in the price of bagels
	A decrease in the price of bread
	An increase in the price of flour

(12)

An improvement in technology shifts the supply curve outward because

	at every price, firms find producing the good to be more profitable.
	the price of the good increases.
	at every price, firms find producing the good to be less profitable.
	the price of the good decreases.

(13)

Which of the following factors does not affect how much bread a baker is willing to produce?

	The price of bread
	The demand for bread
	The cost of inputs
	Technology

(14)

How do expectations of prices affect how much of a good producers are willing to sell?

	Expectations of prices affect only demand, not supply.
	Actual prices, not expectations of prices, affect supply.
	If producers expect prices to fall in the future, they supply less at every price.
	If producers expect prices to rise in the future, they supply less at every price.

(15)

When the price of a good is above equilibrium level,

	the quantity demanded exceeds the quantity supplied.
	the quantity supplied exceeds the quantity demanded.
	the supply curve shifts to the left.
	the supply curve shifts to the right.

(16)

At a price of P₀ in the diagram below, which of the following statements is true?

	Supply equals demand.
	There is excess demand.
	There is excess supply.
	There is scarcity.

(17)

If demand for bread increases at every price, the equilibrium price of bread will

	fall.
	rise.
	remain unchanged.
	depend on income.

(18)

If the demand for bread declines, then

	at the original equilibrium price, there is excess demand.
	at the original equilibrium price, there is excess supply.
	the supply curve shifts to the right.
	the supply curve shifts to the left.

(19)

Peanut butter and jelly are complementary goods. When the price of peanut butter rises, the demand for jelly ________ and the price of jelly ________.

	rises; falls
	rises; rises
	falls; rises
	falls; falls

(20)

The measure of elasticity that economists use is

	always a positive number.
	always a negative number.
	positive when demand is elastic and negative when demand is inelastic.
	negative when demand is elastic and positive when demand is inelastic.

(21)

Which of the following formulas is the correct expression for the slope of a line?

(22)

Graphically how would an increase in income affect the demand for hamburgers?

	The slope of the demand curve would increase.
	The slope of the demand curve would decrease.
	The demand curve would shift outward, parallel to the original demand curve.
	The demand curve would shift inward, parallel to the original demand curve.

(23)

Given the equation P = $6.00 ? $.40Q, where P is the price of the good and Q is the quantity of the good demanded, how many units will this consumer demand if the price is $3.60?

	1.44 units
	3 units
	3.6 units
	6 units

(24)

Which of the following is true about unit elasticity?

	Revenues remain unchanged when the price changes.
	Elasticity of demand increases as one moves down the demand curve.
	Elasticity of demand decreases as one moves down the demand curve.
	The elasticity of demand is greater than one at every point along the demand curve.

(25)

Which of the following could be a determinant of the quantity demanded of a good?

	The price of the good
	The price of related goods
	Income
	Expectations about the future price of the product
	All of the above

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ECON 1P92 Lecture Notes - Lecture 11: Aggregate Supply, Aggregate Demand

ECON 1P92 Full Course Notes

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