16. The profit-maximization problem for a monopolist differs from that of a competitive firm in which of the following ways?
(A)A competitive firm maximizes profit at the point where average revenue equals marginal cost； a monopolist maximizes profit at the point where average revenue exceeds marginal cost.
(B)A competitive firm maximizes profit at the point where marginal revenue equals marginal cost； a monopolist maximizes profit at the point where marginal revenue exceeds marginal cost.
(C)For a competitive firm, marginal revenue at the profit-maximizing level of output is equal to marginal revenue at all other levels of output； for a monopolist, marginal revenue at the profit- maximizing level of output is smaller than it is for larger levels of output.
(D)For a profit-maximizing competitive firm, thinking at the margin is much more important than it is for a profit-maximizing monopolist.
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