The process of adjustment to a new long-run equilibrium in a perfectly competitive industry is not complete if

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If other firms want to enter the industry, it indicates that the industry is still earning economic profit, and the process of adjustment to a new long-run equilibrium is not complete. In a perfectly competitive industry, the entry of new firms will increase the supply and drive down the price until economic profits are zero. Therefore, the absence of new firms entering the industry is a sign that the adjustment process has been completed. Choices B and C are conditions that indicate that the industry has achieved the long-run equilibrium, while choice D is a result of the adjustment process, not a condition for completion.

The Process of Adjustment to a New Long-Run Equilibrium in a Perfectly