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 marginal revenue equals marginal cost; a monopolist maximizes profit at the point where marginal revenue exceeds marginal cost.

B. 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.

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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