If Mary complains that she doesn't feel very well because she ate too many hotdogs, we would conclude that the marginal utility of the last hotdog eaten was
A) positive.
B) zero.
C) very large.
D) negative.

Question

Quizplus · Accepted Answer

The fact that Mary is complaining and not feeling well implies that the marginal utility of the last hotdog she ate is negative. This means that the satisfaction she gained from eating the last hotdog was less than the illness or discomfort she experienced from having too much of it.

If Mary Complains That She Doesn't Feel Very Well Because