c. Greater than marginal cost,

For-profit maximization in any market, MC = MR. However, in monopoly, P > MR as the demand curve for a firm is downward sloping. Hence, P > MR = MC.Because a monopoly faces a downward-facing demand curve, therefore, a monopoly produces less output and sells it at a higher price. Because the marginal revenue for a monopoly is always below the demand curve, therefore, the price will always be above the marginal cost at the equilibrium. A monopolist charges a price greater than marginal cost at the profit-maximizing level of output.