For Adrian, the marginal utility of the 5th energy drink in a day is positive and the marginal utility of the 6th energy drink in a day is zero. This

A) implies that Adrian's demand curve for energy drinks per day will become upward sloping at 6 energy drinks per day.
B) is impossible because each additional unit of consumption of any good must provide positive marginal utility.
C) implies that at a zero price Adrian's demand curve will intersect the quantity axis at 6.
D) implies that Adrian maximizes utility by consuming 5 energy drinks per day.

Question

Gursimran Bajwa · Accepted Answer

Final Answer : C, Explanation :  Adrian's marginal utility becomes zero at the 6th drink, meaning he derives no additional satisfaction from consuming more than 5 drinks. At a zero price, he would consume up to the point where marginal utility is zero, which is 6 drinks.

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