In the long run the perfect competitor's firm's most efficient output

Question

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In the long run, a perfectly competitive firm adjusts its scale of operation until its average total cost is minimized, at which point it produces its most efficient output. This level of output also coincides with where the firm maximizes its profits, as price equals marginal cost equals minimum average total cost in long-run equilibrium for a perfectly competitive firm.

In the Long Run the Perfect Competitor's Firm's Most Efficient