Because long-run equilibrium takes place at an output rate where ATC is higher than the minimal ATC, monopolistically competitive firms are inefficient in terms of productivity.
An industry with a lot of companies offering similar (but not identical) replacement goods or services is known as one with monopolistic competition. In a monopolistic competitive industry, there are few barriers to entry and exit, and no firm's decisions directly affect those of its rivals.
A totally competitive market, where there are an infinite number of enterprises operating, is the antithesis of a monopolistic market. In a truly monopolistic model, the monopoly firm can limit output, raise prices, and make long-term profits that are above average.
A monopolistically competitive industry has the following four traits:
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