If a perfectly competitive firm has economic profits greater than zero, then we know that

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In a perfectly competitive market, firms will enter the industry in response to positive economic profits, increasing supply and driving down prices until all firms have zero economic profit in the long run. Therefore, if a perfectly competitive firm has economic profits greater than zero, the industry is not in long-run equilibrium as new firms have not yet entered to compete away those profits.

If a Perfectly Competitive Firm Has Economic Profits Greater Than