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only a monopolistically competitive firm operates at its efficient scale. both a perfectly competitive firm and a monopolistically competitive firm operate at their efficient scale of production. neither a competitive firm nor a monopolistically competitive firm charges a markup over marginal cost. only a perfectly competitive firm operates at its efficient scale.

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Answer:

Correct Answer:

only a monopolistically competitive firm operates at its efficient scale.

Explanation:

In a given market, a given organization or firm could operate either in a monpolistically competitive or perfectively competitive at its efficient scale. However, in the long run, only a monopolistically competitive firm operates at its efficient scale.