MICROECONOMICS.. help with this question, please?

Question: Which of the following represents the relationship between marginal cost and average total cost? a. marginal cost and average cost are distincts concepts, and there is no fundamental relationship between them b. if the average cost is above the marginal cost, the marginal cost will rise c. if the marginal cost is above the average cost, it will cause the average cost to increase d. if the marginal cost is rising , the average cost must also be rising e. both (c) and (d)

Answer: E. Marginal cost is the cost of producing the last unit, average cost is obvious. If the last unit cost more to produce than the average of all previous units, then the average will rise. Answers C and D basically say the same thing.

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