In a perfectly competitive market, price equals marginal cost, but this condition is not satisfied for the

Question:

In a perfectly competitive market, price equals marginal cost, but this condition is not satisfied for the firm with the revenue and cost conditions depicted in Problem 25-2. In the long run, what would happen if the government decided to require the firm in Problem 25-2 to charge a price equal to marginal cost at the firm's long-run output rate?