The process of adjustment to a new long-run equilibrium in a perfectly competitive industry is complete when

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All of the responses are correct. In a perfectly competitive industry, the process of adjustment to a new long-run equilibrium is complete when no firms want to enter or exit the industry, every firm has adjusted its production process to make the most efficient use of its resources, and investors in the industry receive the standard economy-wide rate of return on their investments. This is because in the long-run, there are no economic profits, and firms are producing at their minimum efficient scale.

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