A.正确

B.错误

正确答案：正确

2、If two goods are substitutes， then an increase in the price of one of them will increase the demand for the other.。

A.正确

B.错误

正确答案：正确

3、An Engel curve is a demand curve with the vertical and horizontal axes reverseD.。

A.正确

B.错误

正确答案：错误

4、Daisy received a tape recorder as a birthday gift and is not able to return it.Her utility function is U（x，y，z）=x+z1/2f（y）where z is the number of tapes she buys， y is the number of tape recorders she has and x is the amount of money she has left to spend.f（y）=0if y<；1and f（y）=8 if y is 1 or greater.The price of tapes is 2 and she can easily afford to buy dozens of tapes.How many tapes will she buy？

A.4

B.6

C.2

D.8

正确答案：4

5、Mike consumes two commodities， x and y； and his utility function is min{x +2y，y+2x}.He chooses to buy 8 units of good x and 16 units of good y.The price of good y is 0.50.What is his income？

A.32

B.40

C.24

D.16

正确答案：16

6、Quasilinear preferences are homothetic when the optimal amount of one of the goods is not affordable.。

A.正确

B.错误

正确答案：错误

7、Walt consumes strawberries and cream but only in the fixed ratio of three boxes of strawber ries to two cartons of cream.At any other ratio， the excess goods are totally useless to him.The cost of a box of strawberries is 10 and the cost of a carton of cream is 10.Walt'；s income is 200.Which of the following is true？

A.Walt demands 10 cartons of cream.

B.Walt demands 10 boxes of strawberries.

C.Walt considers strawberries and cartons of cream to be perfect substitutes.

D.Walt demands 12 boxes of strawberries.

正确答案：Walt demands 12 boxes of strawberries.

8、Madonna buys only two goods.Her utility function is Cobb-Douglas.Her demand functions have which of the following properties？

A.Her demand for one of the two goods does not depend on income.

B.Her demand for neither good depends on income.

C.Her demand for each of the goods depends on income and on the prices of both goods.

D.Her demand for each of the two goods depends only on her income and on the price of that good itself.

正确答案：Her demand for each of the two goods depends only on her income and on the price of that good itself.

9、Daisy received a tape recorder as a birthday gift and is not able to return it.Her utility function is U（x，y，z）=x+z1/2f（y）where z is the number of tapes she buys， y is the number of tape recorders she has and x is the amount of money she has left to spend.f（y）=0if y<；1and f（y）=8 if y is 1 or greater.The price of tapes is 2 and she can easily afford to buy dozens of tapes.How many tapes will she buy？