The correct answer is C. Average cost equals marginal cost.
A monopoly firm is the only seller of a good or service in a market. It faces the demand curve for its product, which is downward-sloping. The firm maximizes profit by producing the quantity at which marginal revenue equals marginal cost. At this quantity, average cost is equal to marginal cost.
Option A is incorrect because the lowest average cost is achieved at a higher level of output than the profit-maximizing level of output.
Option B is incorrect because average cost is above the optimum level of output.
Option
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