Suppose that 25 units of X and 16 units of Y give a consumer the same satisfaction as 15 units of X and 18 units of Y. Then

A. the consumer can exchange five units of X for one unit of Y and keep utility unchanged.
B. the consumer can exchange one unit of X for 1/5 unit of Y and keep utility unchanged.
C. the market rate of exchange of X for Y is 1/5.
D. both a and b 
E. all of the above


Answer: D

Economics

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