中级微观经济学（双语）(西南财经大学) 中国大学MOOC答案2024版100分完整版

11、 Suppose an individual’s preferences for hamburgers (y) and soft drinks (x) can be represented by , then the MRS of x for y at the point x = 20, U=10 is

答案: 0.25

12、 Suppose an individual’s preferences for hamburgers (y) and soft drinks (x) can be represented by , then the MRS of x for y at the point x = 5, U=10 is

答案: 4

13、 Which of the following is not correct?

答案: Two indifference curves could intersect with each other if the preference is not well-behaved.

14、 In microeconomics, if α is at least as preferred as β and β is at least as preferred as γ, then α must be at least as preferred as γ.

答案: 正确

15、 All consumption bundles on the same indifference curve are equally preferred for the consumer.

答案: 正确

16、 For a well-behaved preference, a consumption bundle on a higher indifference curve must bring lower utility level.

答案: 正确

17、 For a well-behaved preference, the indifference curves must be positive sloped.

答案: 错误

18、 For a well-behaved preference, the indifference curves must be straight lines.

答案: 错误

19、 For perfect substitutes, the indifference curves must be straight lines.

答案: 正确

20、 For perfect complements, the indifference curves must be straight lines.

答案: 错误

21、 Given U(A)=2, U(B)=1, according to ordinal utility, this consumer gets twice as much utility from A as from B.

答案: 错误

22、 The properties for well-behaved preference are monotonicity and concavity

答案: 错误

23、 The properties for well-behaved preference are monotonicity and convexity.

答案: 正确

24、 If Ada always would like to add 1 spoon of sugar(s) to 1 cup of coffee(c), Her utility function could be written as U=min{s, c}.

答案: 正确

25、 If a cup of coffee(c) and a cup of tea(t) always provide the same utility for Anne, her utility function could be written as U=min{t, c}.

答案: 错误

26、 A Cobb-Douglas utility function, such as , represents a well-behaved preference.

答案: 正确

27、 Given U(A)=2, U(B)=1, according to ordinal utility, this consumer gets twice as much utility from A as from B.

答案: 错误

28、 Applying a monotonic transformation to the utility function can create another utility function . The two functions, and , represent the same preference.

答案: 正确

29、 An indifference curve shows a combination of two goods that give a consumer equal satisfaction and utility thereby making the consumer indifferent.

答案: 正确

Unit 3Consumer’s Choice Unit 3 Test

1、 You are consuming two goods, hamburgers and soft drink. At your current bundle, the marginal utility you would gain from spending an extra dollar on hamburgers is higher than the marginal utility you would gain from spending an extra dollar on soft drink. What should you do?

答案: Purchase more hamburgers.

2、 Suppose that at current consumption levels an individual’s marginal utility of consuming an extra hamburger is 10 whereas the marginal utility of consuming an extra soft drink is 2. Then the MRS (of soft drinks for hamburgers)—that is, the number of hamburgers the individual is willing to give up to get one more soft drink—is

答案: 1/5.

3、 Suppose the price of hamburger is 20 yuan per unit, and the price of soft drink is 5 yuan per unit. Then the opportunity cost of soft drinks for hamburgers—that is, the number of hamburgers the individual has to give up to get one more soft drink—is

答案: 1/4.

4、 Suppose the price of hamburger is 20 yuan per unit, and the price of soft drink is 5 yuan per unit. Then the opportunity cost of hamburgers for soft drinks—that is, the number of soft drinks the individual has to give up to get one more hamburger—is

答案: 4.

5、 If utility is given by , and , , I=50, this person’s optimal choice is

答案: (10, 10)

6、 If utility is given by , and , , I=50, this person’s optimal choice is

答案: (25, 0)

7、 If an individual’s utility function is given by , and , m=10, his preferred consumption bundle is ( ) .

答案: (5, 2.5)

8、 The slope of the budget constraint line is

答案: the negative of the ratio of the prices (px/py).

9、 If an individual’s indifference curve map does not obey the assumption of a diminishing MRS, then tangencies of indifference curves to the budget constraint may not be points of utility maximization.

答案: 正确

10、 If the price of x falls, the budget constraint rotates outward about the x‑intercept.

答案: 错误

11、 If the price of x falls, the budget constraint rotates outward about the y‑intercept.

答案: 正确

12、 If the price of x falls, the budget constraint rotates inward and the consumer gets worse off.

答案: 错误

13、 If the price of y falls, the budget constraint rotates outward and the consumer cannot get worse off.

答案: 正确

14、 If consumer’s income falls, the budget constraint rotates outward and the consumer cannot get worse off.

答案: 错误

15、 If consumer’s income falls while the prices of commodities keep constant, the budget constraint shifts inward parallelly and the consumer get better off.

答案: 错误

16、 If consumer’s income increases while the prices of commodities keep constant, the budget constraint shifts outward parallelly and the consumer cannot get worse off.

答案: 正确

17、 If the interior solution exists, consumer’s optimal choice should satisfy Px/Py = MUx/MUy.

答案: 正确

18、 When Px/Py > MUx/MUy, the consumer can increase the utility level by increasing the consumption in good x.

答案: 错误

19、 When Px/Py < MUx/MUy, the consumer can increase the utility level by decreasing the consumption in good y.

答案: 正确

Unit 4 Demand（2） Unit 4 Test

1、 If an individual’s utility function is given by U(x,y)=xy, px = 1, py = 4, and income I = 100, please calculate his or her preferred consumption bundle.

答案: (x,y)=(50, 12.5)

2、 If an individual’s utility function is given by U(x,y)=xy, px = 2, py = 4, and income I = 200, please calculate his or her preferred consumption bundle.

答案: (x,y)=(50,25)

3、 Regardless of her income and regardless of prices, Amy always spends 45% of her income on clothing and food, 15% on transportation, and 40% on entertainment. This behavior is consistent with the following:

答案: Amy has a Cobb-Douglas utility function.

4、 If the price of a good X increases, the following can be said about the income and substitution effects of the price increase on the demand for X:

答案: While the latter is always negative, the former can be either positive or negative.

5、 Sam consumes two goods, x and y. If the price of good x increases and his substitution and income effects change demand in opposite directions:

答案: good x must be an inferior good.

6、 Smith consumes two goods, x and y. If the price of good x increases and his substitution and income effects change demand in same direction:

答案: good x must be a normal good.

7、 Simon consumes two goods, X and Y. If the price of good X increases and his demand for X increases:

答案: good X must be a Giffen good.

8、 Mary’s utility function is U(x, y)=4lnx+y. Given her current income and the current relative prices, she consumes 20 units of x and 15 units of y. If her income doubles, while prices stay constant, how many units of x will she consume after the change in income?

答案: 20

9、 Robert’s utility function is U (x, y) = xy. The price of x is $3 and the price of y is $1. If we draw x on horizontal axis, and y on vertical axis. Robert’s income offer curve is:

答案: a ray from the origin with a slope of 3.

10、 Sherry’s utility function is U (x, y) = xy. The price of x is $3 and the price of y is $1. If we draw x on horizontal axis, and income on vertical axis. Sherry’s Engel curve of good x is:

答案: a ray from the origin with a slope of 6.

11、 Molly’s utility function is U (x, y) = xy. Molly’s income is $200 and the price of y is $1. If we draw x on horizontal axis, and y on vertical axis. Molly’s px-price offer curve is:

答案: a line parallel to the x axis.

12、 Bill unexpectedly inherits $50,000 from a rich uncle. He is observed to consume fewer hamburgers than he used to. We conclude that:

答案: Will’s preferences are not homothetic.

13、 Prudence was maximizing her utility subject to her budget constraint. Then prices changed. After the price change she is better off. Therefore, the new bundle costs more at the old prices than the old bundle did.

答案: 正确

14、 Dean’s utility function is . Currently he is buying some of both goods. If his income rises and prices don’t change, he will buy more of both goods.（Hint：Dean’s utility function is a quasilinear utility function.）

答案: 错误

15、 If the demand for X decreases as its price decreases, it violates the law of demand.

答案: 正确

16、 Engel curve for good X reflects the relationship between the demand quantity of good x and its own price.

答案: 错误

17、 Income offer curve shows the trace of consumer’s optimal bundles as income changes.

答案: 正确

18、 Price offer curve shows how the consumer’s optimal bundles move as price changes.

答案: 正确

19、 For the homothetic preference, the MRS depends only on the ratio of the quantities of the two goods.

答案: 正确

20、 For the homothetic preference, the MRS depends only on the quantity of one good.

答案: 错误

21、 A normal good must be an ordinary good.

答案: 错误

22、 An ordinary good must be a normal good.

答案: 正确

23、 An inferior good cannot be an ordinary good.

答案: 错误

24、 An inferior good must be a Giffen good.

答案: 错误

25、 The quantity demanded for a normal good rises with income decrease, while the quantity demanded for an inferior good falls with income decrease.

答案: 错误