chap5中级宏观经济学答案 华中科技大学

Microeconomics, 4e (Perloff)

Chapter 5 Applying Consumer Theory

5.1 Deriving Demand Curves

1) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks assuming he has $20 to spend on these goods. Which of the following points are on Bobby's price-consumption curve? A) 10 snacks and 20 juices B) 10 snacks and 0 juices C) 10 snacks and 5 juices D) 10 snacks and 15 juices Answer: D

Topic: Deriving Demand Curves

2) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks assuming he has $20 to spend on these goods. Which of the following points are on Bobby's demand curve for snacks? A) p = 2, q = 10 B) p = 2, q = 13 C) p = 2, q = 5 D) p = 1, q = 20 Answer: C

Topic: Deriving Demand Curves

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3) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks. This information could be used to determine A) the slope of Bobby's demand curve for juice.

B) the amount by which Bobby's demand curve for juice shifts when his income rises.

C) the amount by which Bobby's demand curve for juice shifts when the price of snacks rises. D) All of the above. Answer: C

Topic: Deriving Demand Curves

4) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks. As the price of snacks rises, Bobby's utility A) stays the same. B) increases. C) decreases.

D) might change, but there is not enough information to determine. Answer: C

Topic: Deriving Demand Curves

5) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks. Bobby's demand for snacks is A) unit elastic. B) elastic. C) inelastic.

D) perfectly elastic. Answer: C

Topic: Deriving Demand Curves

6) The above figure shows Bobby's indifference map for juice and snacks. Also shown are three budget lines resulting from different prices for snacks. As the price of snacks rises, the price for juice A) stays the same. B) increases. C) decreases

D) might change, but there is not enough information to determine. Answer: A

Topic: Deriving Demand Curves

7) An individual's demand curve for a good can be derived by measuring the quantities selected as A) the price of the good changes.

B) the price of substitute goods changes. C) income changes. D) All of the above. Answer: A

Topic: Deriving Demand Curves

8) As the price of a good rises, the consumer will experience A) a desire to consume a different bundle. B) a decrease in utility.

C) a southwesterly movement on the indifference map. D) All of the above. Answer: D

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9) An increase in the price of a good causes A) a change in the slope of the budget line. B) an increase in the consumption of that good.

C) a rightward shift of the demand curve for that good. D) a parallel rightward shift of the budget line. Answer: A

Topic: Deriving Demand Curves

10) Suppose a graph is drawn to show a consumer's preferences for football tickets and basketball tickets. The quantity of football tickets is measured on the horizontal axis. If the price-consumption curve is horizontal when the price of football tickets changes, then A) football tickets are an inferior good.

B) the demand for football tickets is perfectly elastic. C) the demand for football tickets is unit elastic.

D) the demand curve for football tickets will be horizontal. Answer: C

Topic: Deriving Demand Curves

11) In the relevant price range a demand curve for a Giffen good would be A) upward sloping. B) downward sloping. C) horizontal. D) vertical. Answer: A

Topic: Deriving Demand Curves

12) Suppose the quantity of x is measured on the horizontal axis. If the price consumption curve is vertical when the price of x changes, then the demand for x is A) perfectly elastic. B) perfectly inelastic. C) unit elastic.

D) There is not enough information to determine the price elasticity of demand for x. Answer: B

Topic: Deriving Demand Curves

For the following, please answer \

13) If the price-consumption curve is upward sloping when the price of the good measured on the horizontal axis changes, then the demand curve for that good will be upward sloping.

Answer: False. An upward-sloping price-consumption curve indicates that as the price of the good falls, more of both goods will be purchased. So, the demand curve for the good measured on the horizontal axis slopes downward.

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14) Draw two graphs, one directly above the other. On the upper graph, label the vertical axis Good X and label the horizontal axis Good Y. On the lower graph, label the vertical axis the Price of good Y and label the horizontal axis Good Y. In the upper graph, show the income and substitution effects of a decrease in the Price of good Y when Y is a Giffen good. Draw the corresponding demand curve for Good Y in the lower graph. Answer:

See the above figure. Point A is the original consumption point. The movement from point A to point B is the substitution effect. The movement from point B to point C is the income effect.

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15) The above figure shows a consumer's indifference curves for soda and all other goods. Assuming a budget of $100, derive the consumer's demand for soda for prices of $4 and $10 per case of soda. Estimate the price elasticity of demand for soda.

Answer: At a price of $4, 15 cases are purchased, At a price of $10, 6 cases are purchased. In both cases, the same total amount, $60, is spent on soda. This implies unit elasticity.

Topic: Deriving Demand Curves

16) Use the Slutsky equation to show that a Giffen good must be an inferior good, BUT an inferior good need not be a Giffen good.

Answer: The Slutsky equation may be written as dQ/dpTotal dpTotal = dQ/ dpsubs - _(dQ/dI). For a Giffen good, dQ/dpTotal is positive, which implies that - _(dQ/dI) must be positive and large enough to offset dQ/ dpsubs, which is always negative. For any inferior good, however, - _(dQ/dI) is positive but not necessarily large enough to make dQ/ dpTotal positive.

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5.2 How Changes in Income Shift Demand Curves

1) A movement upward along an upward sloping Engel curve corresponds to A) upward sloping indifference curves. B) crossing indifference curves. C) a rotation in the budget constraint. D) a parallel shift in the budget constraint. Answer: D

Topic: How Changes in Income Shift Demand Curves

2) When deriving an Engel curve the prices of both goods A) are held constant.

B) increase by the same percentage as income. C) decrease by the same percentage as income. D) can either decrease, increase or stay the same. Answer: A

Topic: How Changes in Income Shift Demand Curves

3) The above figure shows Larry's indifference map and budget lines for ham and pork. Which of the following statements is TRUE? A) Pork is an inferior good. B) Ham is an inferior good.

C) Neither pork nor ham is an inferior good. D) Both ham and pork are inferior goods. Answer: B

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4) The above figure shows Larry's indifference map and budget lines for ham and pork. Which of the following statements is TRUE?

A) Larry's Engel curve for pork will be upward sloping. B) Larry's Engel curve for pork will be downward sloping. C) Larry's Engel curve for pork will be backward bending.

D) Larry's Engel curve for pork cannot be derived from the information provided. Answer: A

Topic: How Changes in Income Shift Demand Curves

5) The above figure shows Larry's indifference map and budget lines for ham and pork. Which of the following statements is TRUE?

A) Larry's demand curve for pork shifts rightward when his income increases. B) Larry's income elasticity of demand for pork is greater than zero. C) Pork is a normal good. D) All of the above. Answer: D

Topic: How Changes in Income Shift Demand Curves

6) After Joyce and Larry purchased their first house, they made additional home improvements in response to increases in income. After a while, their income rose so much that they could afford a larger home. Once they realized they would be moving, they reduced the amount of home improvements. Their Engel curve for home improvements on their current home is A) negatively sloped. B) flat.

C) positively sloped. D) backward bending. Answer: D

Topic: How Changes in Income Shift Demand Curves

7) Suppose the quantity of x is measured on the horizontal axis. If the income consumption curve is vertical, then the income elasticity of demand for x is A) 0. B) 1. C) -1.

D) There is not enough information to determine the income elasticity of demand for x. Answer: A

Topic: How Changes in Income Shift Demand Curves

8) An inferior good exhibits A) a negative income elasticity. B) a downward sloping Engel curve.

C) a decline in the quantity demanded as income rises. D) All of the above. Answer: D

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9) When John's income was low, he could not afford to dine out and would respond to a pay raise by

purchasing more frozen dinners. Now that his income is high, a pay raise causes him to dine out more often and buy fewer frozen dinners. Which graph in the above figure best represents John's Engel curve for frozen dinners? A) Graph A B) Graph B C) Graph C D) Graph D Answer: A

Topic: How Changes in Income Shift Demand Curves

10) When John's income was low, he could not afford to dine out and would respond to a pay raise by

purchasing more frozen dinners. Now that his income is high, a pay raise causes him to dine out more often and buy fewer frozen dinners. Which graph in the above figure best represents John's Engel curve for dining out?

A) Graph A B) Graph B C) Graph C D) Graph D Answer: B

Topic: How Changes in Income Shift Demand Curves

11) Even though Mary's income is very low, she makes sure that she purchases enough milk for her family to drink. As her income rises, she does buy more milk. Which graph in the above figure best represents Mary's Engel curve for milk? A) Graph A B) Graph B C) Graph C D) Graph D Answer: C

Topic: How Changes in Income Shift Demand Curves

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12) When John was in college and his income was low, he drank \increased, he purchased better-quality beer and less \represents John's Engel curve for \ A) Graph A B) Graph B C) Graph C D) Graph D Answer: D

Topic: How Changes in Income Shift Demand Curves

13) Which graph in the above figure best represents a good that is an inferior good at some income levels, and a normal good at other income levels? A) Graph A B) Graph B C) Graph C D) Graph D Answer: A

Topic: How Changes in Income Shift Demand Curves

14) If consumer income and prices increase by the same percentage A) the consumer will buy more of both goods.

B) the consumer will buy more of both goods if they are both normal goods. C) the consumer will buy less of both goods if they are both inferior goods. D) the consumer's utility maximizing bundle stays the same. Answer: D

Topic: How Changes in Income Shift Demand Curves

For the following, please answer \

15) An increase in income (all else equal) will ALWAYS lead to a parallel shift of the budget line.

Answer: True. Since prices are unchanged the relative prices of the goods stays the same and thus the slope of the budget line.

Topic: How Changes in Income Shift Demand Curves

16) Explain what the slope of the income consumption curve shows about the income elasticity of demand. Answer: A positive slope of the income consumption curve is associated with a positive income elasticity of demand, and a negatively sloped income consumption curve is associated with a negative income elasticity of demand. The income consumption curve represents how consumption changes with an increase in income. An upward sloping income consumption curve represents an increase in consumption as income rises, as does a positive income elasticity.

Topic: How Changes in Income Shift Demand Curves

17) Why can't all goods be inferior?

Answer: If all goods were inferior, an increase in income would lead to a decline in the quantity demanded for all goods. This, however, would leave the consumer below the budget line and therefore not achieving the highest utility possible.

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18) The above figure shows three different Engel curves. Rank them in terms of income elasticity.

Answer: Engel curve A implies that a certain level of income is required before any of the good is purchased. Engel curve B implies that the quantity demanded is proportional to income (unit elastic). Engel curve C implies that the good is a necessity since it would be consumed even if income were zero. Thus _A > _B > _C.

Topic: How Changes in Income Shift Demand Curves

19) When income increases by 1%, the quantity demanded of a good decreases by 2%. What is the income elasticity of the good? Is the good normal or inferior? Why?

Answer: The income elasticity is -2. The good is inferior because the income elasticity is negative.

Topic: How Changes in Income Shift Demand Curves

20) Why would you expect the demand for diamond jewelry to fall faster than plastic, costume jewelry when all incomes fall?

Answer: The income elasticities differ for the two goods. Diamond jewelry most likely has a larger income elasticity than costume jewelry.

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21) Draw budget constraints, indifference curves, and the income consumption curve for a good that has an income elasticity that is perfectly inelastic. Answer:

See the above figure.

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5.3 Effects of a Price Change

1) Median household income is $50,000 per year. The typical household spends about $125 per year on milk, which has an income elasticity of about 0.07. From this information, we can conclude that A) milk is a luxury. B) milk is a Giffen good.

C) the income effect from a change in the price of milk is very large. D) the income effect from a change in the price of milk is very small. Answer: D

Topic: Effects of a Price Change

2) When the price of a good changes, the total effect of the price change on the quantities purchased can be found by comparing the quantities purchased A) on the old budget line and the new budget line.

B) on the original indifference curve when faced with the original prices and when faced with the new prices. C) on the new budget line and a hypothetical budget line that is a parallel shift back to the original indifference curve.

D) on the new indifference curve. Answer: A

Topic: Effects of a Price Change

3) When the price of a good changes, the substitution effect can be found by comparing the equilibrium quantities purchased

A) on the old budget line and the new budget line.

B) on the original indifference curve when faced with the original prices and when faced with the new prices. C) on the new budget line and a hypothetical budget line that is a shift back to the original indifference curve parallel to the new budget line. D) on the new indifference curve. Answer: B

Topic: Effects of a Price Change

4) When the price of a good changes, the income effect can be found by comparing the equilibrium quantities purchased

A) on the old budget line and the new budget line.

B) on the original indifference curve when faced with the original prices and when faced with the new prices. C) on the new budget line and a hypothetical budget line that is a shift back to the original indifference curve parallel to the new budget line. D) on the new indifference curve. Answer: C

Topic: Effects of a Price Change

5) The substitution effect can be measured holding ________ constant. A) income B) utility

C) the price of one good D) the price of all goods Answer: B

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6) Suppose that frozen dinners were once a normal good for John, but now frozen dinners are an inferior good for him. John's demand curve for frozen dinners A) has become steeper as a result. B) has become flatter as a result. C) has not changed as a result. D) has disappeared as a result. Answer: A

Topic: Effects of a Price Change

7) One characteristic of a Giffen good is that it A) is a luxury good. B) is an inferior good.

C) has an upward-sloping Engel curve. D) All of the above. Answer: B

Topic: Effects of a Price Change

8) A Giffen good has

A) a positive substitution effect. B) a negative income effect.

C) a larger income effect than substitution effect. D) All of the above. Answer: D

Topic: Effects of a Price Change

9) If a good is an inferior good, then its A) demand curve will be upward sloping.

B) income effect reinforces the substitution effect. C) income elasticity is negative. D) Engel curve cannot be drawn. Answer: C

Topic: Effects of a Price Change

10) Suppose Lisa spends all of her money on books and coffee. When the price of coffee decreases, the A) substitution effect on coffee is positive, and the income effect on coffee is positive. B) substitution effect on coffee is ambiguous, and the income effect on coffee is ambiguous. C) substitution effect on coffee is positive, and the income effect on coffee is ambiguous. D) substitution effect on coffee is ambiguous, and the income effect on coffee is positive. Answer: C

Topic: Effects of a Price Change

11) In the case of a normal good

A) demand curves always slope downward.

B) the income effect and substitution effect are in the same direction. C) the Engel curve slopes upward. D) All of the above. Answer: D

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12) The above figure shows Bobby's indifference map for soda and juice. B1 indicates his original budget line. B2 indicates his budget line resulting from a decrease in the price of soda. What change in quantity best represents his substitution effect? A) 3 B) 10 C) 15 D) 7

Answer: A

Topic: Effects of a Price Change

13) The above figure shows Bobby's indifference map for soda and juice. B1 indicates his original budget line. B2 indicates his budget line resulting from a decrease in the price of soda. What change in quantity best represents his income effect? A) 3 B) 10 C) 15 D) 7

Answer: D

Topic: Effects of a Price Change

14) The above figure shows Bobby's indifference map for soda and juice. B1 indicates his original budget line. B2 indicates his budget line resulting from an increase in the price of soda. From the graph, one can conclude that

A) Bobby views soda as an inferior good.

B) Bobby's demand for soda is perfectly inelastic. C) Bobby views soda as a normal good.

D) the income elasticity of demand for soda is 1. Answer: C

Topic: Effects of a Price Change

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15) When measuring the substitution effect one uses the change along A) the old indifference curve. B) the new indifference curve.

C) either the old or the new indifference curve. D) the budget constraint. Answer: C

Topic: Effects of a Price Change

16) The Slutsky equation shows that, holding the total effect constant, the income effect will be larger for goods that

A) have a smaller substitution effect.

B) make up a larger percentage of a household's budget. C) have perfectly inelastic demand curves. D) All of the above. Answer: B

Topic: Effects of a Price Change

17) Suppose that the interest rate paid to savers increases. As a result, Tom wishes to save less. This suggests that, for Tom,

A) the substitution effect is greater than the income effect. B) the income effect is greater than the substitution effect. C) utility maximization is not occurring. D) future consumption is a luxury. Answer: B

Topic: Effects of a Price Change

18) Suppose that the interest rate paid to savers increases. As a result, Tom wishes to save more. This suggests that, for Tom,

A) the substitution effect is greater than the income effect. B) the income effect is greater than the substitution effect. C) utility maximization is not occurring. D) future consumption is a luxury. Answer: A

Topic: Effects of a Price Change

For the following, please answer \

19) If a consumer is compensated for the income effect that occurs when the price of a good increases, then his demand curves can never slope upward.

Answer: True. The demand curve would only include the substitution effect. Even for Giffen goods, dq/dp is negative holding utility constant.

Topic: Effects of a Price Change

20) A good may be inferior at some income levels and normal at others.

Answer: True. A consumer may demand more of the good at low income levels and less of the good at higher income levels. Hamburger or macaroni and cheese dinners may be examples of such goods.

Topic: Effects of a Price Change

21) If the Engel curve for a good is upward sloping, the demand curve for that good must be downward sloping.

Answer: True. If the Engel curve is upward sloping, the good is normal. As a result, the income effect will reinforce the substitution effect and guarantee a downward-sloping demand curve.

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22) Suppose Joe earns $1,000 in year 1 and $0 in year 2. Any amount he saves will earn interest at a rate of 10%. Draw Joe's budget line. (Hint: He can either consume all $1000 this year or consume nothing this year and have $1,100 next year.) Assuming convex indifference curves, show that an increase in the rate of interest can cause Joe's savings to either increase or decrease. Explain in terms of income and substitution effect. Answer:

See the above figure. On the graph, his original bundle is e1 so that his savings equal 1000 - C1*. A higher interest rate rotates the budget line so that, depending on the shape of his indifference map, he may choose either e2, which means savings increase, or e3, which means savings decrease. One plus the interest rate represents the price of current consumption. A higher interest rate has two effects. The substitution effect means that Joe will save more because current consumption has become more expensive. The income effect says Joe will save less because, with the higher interest rate, lower savings could actually generate more future consumption.

Topic: Effects of a Price Change

23) Many manufacturers sell products labeled as having imperfections at a discount at their factory outlets but do not ship these imperfect goods to regular retail outlets. Why?

Answer: There is some substitutability between the goods, but imperfects sell for a lower price. Suppose, for example, the good sells for $2, but imperfects sell for $1. Both goods cost the same to ship, say $1. As a result, the relative price of an imperfect at a factory outlet is (1/2) but rises to (2/3) at the retail outlet, where imperfects will not sell because of the higher relative price.

Topic: Effects of a Price Change

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5.4 Cost-of-Living Adjustments

1) Due to inflation, nominal prices are usually A) equal to real prices. B) smaller than real prices. C) larger than real prices.

D) a constant proportion different from real prices. Answer: C

Topic: Cost-of-Living Adjustments

2) A consumer price index adjustment overcompensates for inflation because it ignores A) the income effect when relative prices change. B) the substitution effect when relative prices change. C) that some goods are inferior.

D) that the substitution effect may offset the income effect. Answer: B

Topic: Cost-of-Living Adjustments

3) Employing a fixed-weight index like the Consumer Price Index to adjust a person's salary in response to inflation will overcompensate this person because doing so will allow this person to A) buy the same bundle of goods as he did before the inflation. B) achieve a higher level of utility than he did before the inflation. C) achieve the same level of utility as before the inflation. D) buy more of all goods. Answer: B

Topic: Cost-of-Living Adjustments

4) Under which of the following conditions will there be no substitution bias in the CPI? A) Indifference curves are convex. B) Indifference curves are L-shaped. C) Indifference curves are linear.

D) Indifference curves are downward sloping. Answer: B

Topic: Cost-of-Living Adjustments

5) Under which of the following conditions will there be no substitution bias in the CPI? A) Lower-priced goods increase in price by a greater percentage than do higher-priced goods. B) Higher-price goods increase in price by a greater percentage than do lower-priced goods. C) All goods change in price by the same amount. D) All goods change in price by the same percentage. Answer: D

Topic: Cost-of-Living Adjustments

6) A true cost-of-living adjustment in response to a change in prices would compensate consumers so that they would be able to

A) purchase the same bundle they purchased before prices changed. B) achieve the same level of utility they did before prices changed. C) face the same choices they did before prices changed.

D) achieve an increase in utility that is equal to the rate of inflation. Answer: B

Topic: Cost-of-Living Adjustments

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7) Richard receives government transfer payments and currently consumes 5 guns and 6 goose livers.

Assume the price of guns decreases by 10% and the price of goose liver increases by 20%. The government raises Richard's transfer payments so he can still afford 5 guns and 6 goose livers. Does this constitute a true cost-of-living adjustment?

A) No. Richard is overcompensated. B) No. Richard is undercompensated.

C) Yes. The payment just achieves the right level of compensation. D) Not enough information. Answer: A

Topic: Cost-of-Living Adjustments

8) Before an uneven rise in prices Allan consumed 5 bread and 6 juice. After the price increase and with an increased welfare payment from the government Allan consumes 4 bread and 7 juice. Does the government payment represent a true cost-of-living adjustment?

A) Yes, if the two consumption bundles lie on the same indifference curve. B) Yes, if the second bundle yields more utility than the first. C) No, the first bundle is clearly preferred. D) Not enough information. Answer: A

Topic: Cost-of-Living Adjustments

For the following, please answer \

9) Inflation over time necessarily makes consumers worse off.

Answer: False. Wages also increase over time. Workers may earn the price of some goods in less time than in the past.

Topic: Cost-of-Living Adjustments

10) Using the CPI to compensate workers for inflation is appropriate because, in the face of a change in relative prices, people should be allowed to purchase the same bundle as they did before the price changes. Answer: False. This assumes that people would still prefer the original bundle. Because they are facing a new set of relative prices, compensating people so that they could purchase the original bundle will allow them to be able to achieve a higher level of utility than they did before the price changes.

Topic: Cost-of-Living Adjustments

11) Suppose the typical consumer only purchases food and clothing, and her utility can be expressed as U = F * C. Currently, food costs $5 per unit and clothing costs $2 per unit. Her income is $70. If the price of food increases to $6, compare the resulting Laspyre's price index with a true cost of living index.

Answer: Maximizing utility subject to the initial constraint (5F + 2C = 70) yields C/F = 5/2 or F = 7 and C = 17.5. The Laspyre's price index calculates the ratio of the income necessary to achieve the original bundle relative to the original income. In this case [(6 * 7) + (2 * 17.5)]/70 = 1.10. The true cost of living index calculates the ratio of the income necessary to achieve the original level of utility relative to the original income. Utility is held constant when C * F = 17.5 * 7 = 122.5. The consumer is on the new budget line when C/F = 3. Combining yields F = 6.39 and C = 19.17. At the new prices, this requires an income of 76.68 and a resulting cost of living index of 76.68/70 = 1.095.

Topic: Cost-of-Living Adjustments

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5.5 Deriving Labor Supply Curves

1) The price of leisure A) is the same for everyone.

B) depends on the number of hours worked. C) is measured as foregone earnings. D) is immeasurable. Answer: C

Topic: Deriving Labor Supply Curves

2) If a person supplies more hours of labor in response to a wage increase, then A) the substitution effect is greater than the income effect. B) the income effect is greater than the substitution effect. C) the income effect equals the substitution effect. D) the person is not maximizing utility. Answer: A

Topic: Deriving Labor Supply Curves

3) If a person supplies fewer hours of labor in response to a wage increase, then A) the substitution effect is greater than the income effect. B) the income effect is greater than the substitution effect. C) the income effect equals the substitution effect. D) the person is not maximizing utility. Answer: B

Topic: Deriving Labor Supply Curves

4) Empirical studies have found that the labor supply curves for most parts of the population are A) backward-bending. B) upward-sloping. C) downward-sloping. D) nearly vertical. Answer: D

Topic: Deriving Labor Supply Curves

5) A backward-bending labor supply curve implies that

A) the substitution effect dominates the income effect at higher wage rates but not at lower wage rates. B) the substitution effect dominates the income effect at lower wage rates but not at higher wage rates. C) leisure is an inferior good. D) workers are irrational. Answer: B

Topic: Deriving Labor Supply Curves

6) If Bobby thinks that leisure is an inferior good, then his labor supply curve A) is backward bending.

B) is always negatively sloped. C) is always positively sloped. D) does not exist. Answer: C

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7) A tax cut that raises the after-tax wage rate will most likely result in more hours worked if A) tax rates were low already.

B) the relevant portion of the labor supply curve is upward sloping. C) the relevant portion of the labor supply curve is downward sloping. D) workers can be easily fooled. Answer: B

Topic: Deriving Labor Supply Curves

8) If workers are in the backward-bending section of their labor supply curves, than an increase in the income tax rate will

A) increase the tax revenue and increase the number of hours worked. B) increase the tax revenue and decrease the number of hours worked. C) decrease the tax revenue and increase the number of hours worked. D) decrease the tax revenue and decrease the number of hours worked. Answer: A

Topic: Deriving Labor Supply Curves

9) In response to an increase in the wage rate, the substitution effect will cause a person to A) supply fewer hours of labor. B) supply more hours of labor. C) supply the same hours of labor.

D) have a backward bend in her labor supply curve. Answer: B

Topic: Deriving Labor Supply Curves

10) In response to an increase in the wage rate, the income effect will usually cause a person to A) supply fewer hours of labor. B) supply more hours of labor. C) supply the same hours of labor. D) have a horizontal labor supply curve. Answer: A

Topic: Deriving Labor Supply Curves

For the following, please answer \

11) A tax cut will unambiguously lower income-tax revenue.

Answer: False. It depends on how the quantity of labor supplied responds to the increase in the after-tax wage rate. If the income effect dominates, the quantity of labor supplied falls and so will tax revenue. If the substitution effect dominates, the quantity of labor supplied increases, and income-tax revenue could

increase. This is a function of whether the after-tax wage was low already because the tax rate was relatively high.

Topic: Deriving Labor Supply Curves

12) An increase in unearned income always creates a disincentive to work

Answer: False. The effect on labor supply will also depend on the individual's preferences towards work (leisure).

Topic: Deriving Labor Supply Curves

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