In the long run, marginal cost must equal marginal revenue for a monopolistically competitive firm, and the minimum point of the long-run average cost curve.

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In the long run, a monopolistically competitive firm will produce at a point where marginal cost equals marginal revenue, but this point does not necessarily coincide with the minimum of the long-run average cost curve, allowing for the possibility of excess capacity.

In the Long Run, Marginal Cost Must Equal Marginal Revenue