In the comparison of pure monopoly and pure competition, the monopolistically competitive industries might have economic profits, they will diminish as competitors enter, and there will be productive inefficiency. The Option C is correct.
The monopolistically competitive industries means those industries that contain more than a few firms, each of which offers a similar but not identical product. The fast food market is an example because the fast food market is quite competitive and yet each firm has a monopoly in its own product.
In the long run, the monopolistic competition leads to a monopolistic price but not to monopolistic profits, the statement is true since P > MC, but the availability of close substitutes pushes the price of the average firm down until it equals ATC. The Option A is correct.
A monopolistic competition occurs when many companies offer a competing products or services that are similar but not perfect or substitutes one. The barriers in a monopolistic competitive industry are low and the decisions of any one firm do not directly affect its competitors.
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