The correct answer is: In the long run, a multiple equality occurs where price is equal to marginal cost which is equal to minimum average total cost.
It occurs when companies are reaching zero economic profit and when there is no insertion of new companies in the sector. This occurs when, in the long run, companies produce at the minimum point of their average cost curve.
Therefore, in a long-term equilibrium situation in a competitive sector, production is adjusted to the minimum point of its average cost curve, where companies obtain only normal profits and not impacted by changes in demand, for example.
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