JAMB Economics 2021 Objective — Question 24

Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Economics 2021 Objective paper, with the correct answer and a full explanation.

24. For a free good, the marginal cost of one more user is always a. One b. Zero c. Positive d. Negative

A. One
B. ZeroCorrect
C. Positive
D. Negative

Explanation

A free good is unlimited in supply, so supplying it to one additional user costs nothing extra — its marginal cost is zero. (Note: the original source's answer key lists 'C', but its own explanation says 'no marginal cost,' which actually supports 'Zero'; B is the answer consistent with that explanation.)

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