Pat's total utility after eating 99 Reese's Peanut Butter Cups was greater than his total utility after eating 100 Reese's Peanut Butter Cups. Therefore, Pat's marginal utility from the 100ᵗʰ peanut butter cup was:
A)positive, but less than one.
B)positive, but less than his marginal utility for the 99ᵗʰ peanut butter cup.
C)zero.
D)negative.

Question

Quizplus · Accepted Answer

Since Pat's total utility was lower after he ate the 100ᵗʰ Peanut Butter Cup, it must have been true that the marginal utility of the 100ᵗʰ peanut butter cup was negative.

Pat's Total Utility After Eating 99 Reese's Peanut Butter Cups