When firms in a perfectly competitive market face the same costs, in the long-run they must be operating:

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Quizplus · Accepted Answer

In a perfectly competitive market, firms face the same costs and are price takers. This means that they can sell all their output at the market price. In the long-run, firms only stay in the market if they can cover their costs, including all opportunity costs. At the efficient scale of production, firms produce where marginal cost equals marginal revenue, which ensures that they are producing at the minimum efficient scale and operating with zero economic profits. Therefore, in the long-run, firms in a perfectly competitive market must be operating at their efficient scale.

When Firms in a Perfectly Competitive Market Face the Same