单选题

Partial information on three baskets containing goods A and B is given in the table below. The marginal rate of substitution of B for A, (MRSBA), at Basket 2 is also provided.

Basket	Units of A	Units of B	MRS_BA
1	?	30
2	50	35	4.0
3	40	40

A consumer’s indifference curves are strictly convex and he claims that he is indifferent between Baskets 2 and 3. If he is also indifferent between Baskets 1 and 3, the number of units of A in basket 1 is most likely:

A、 equal to 60
B、 less than 60
C、 greater than 60

【正确答案】 C

【答案解析】

C is correct. Because the consumer is indifferent between all three baskets, they must all fall on the same indifference curve. The MRS_BA at Basket 2 is 4,
meaning that the slope of the indifference curve at that point is –4, hence ∆A/∆B = –4 ＝