Both a perfectly competitive firm and a monopolist:

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Both a perfectly competitive firm and a monopolist maximize profit by setting marginal cost equal to marginal revenue. However, the other options are incorrect. A perfectly competitive firm may earn zero economic profit in the long run, while a monopolist may earn positive economic profit. Additionally, a monopolist does not set price equal to marginal cost or average total cost, unlike a perfectly competitive firm. Both firms may be price takers in their respective markets, but this is not a defining characteristic of their profit-maximizing behavior.

Both a Perfectly Competitive Firm and a Monopolist