In order for a monopolist to earn an economic profit in short-run equilibrium, marginal revenue must be equal to zero.

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In order for a monopolist to earn an economic profit in short-run equilibrium, marginal revenue must be greater than marginal cost and the monopolist must be charging a price higher than their average variable cost. Marginal revenue being equal to zero would indicate that the monopolist is only breaking even and not earning a profit.

In Order for a Monopolist to Earn an Economic Profit