How does the profit maximization condition for a monopoly differ from that for a perfectly competitive firm? How does this difference impact efficiency under each market structure? Explain

For monopolistic firms, the optimal profit occurs at the point where the marginal revenue is equal to the marginal cost (MR = MC).

For a perfectly competitive firm, the optimal profit occurs at the point where the market price is equal to the marginal cost (P = MC).

Competitive firms produce a quantity that is Pareto efficient since the market price is equal to their marginal costs. However, the marginal revenue for a monopolistic firm lies below the demand curve, indicating that the price charged by the firm is greater than its marginal cost. Thus, a monopoly produces a quantity that is less than the Pareto efficient level of output and charges a higher price than the competitive firm.