Both competitive firms and monopolies produce at the level where marginal cost equals marginal revenue. ​Then, other things remaining the​ same, why is price lower in a competitive market than in a​ monopoly? A. Competitive markets face perfectly elastic demand and marginal​ revenue, while monopolies face​ downward-sloping demand and marginal revenue. B. Competitive markets face perfectly inelastic demand and marginal​ revenue, while monopolies face perfectly elastic demand and marginal revenue. C. The government puts a cap on how much a competitive firm can​ charge, while a monopolist can charge any price it chooses. D. A competitive market sets its price where marginal cost equals​ demand, while a monopolist sets its price where marginal cost equals marginal revenue.

A. Competitive markets face perfectly elastic demand and marginal​ revenue, while monopolies face​ downward-sloping demand and marginal revenue.

Explanation:

In the case when competitive firms and monopolies generated at the level in which the marginal cost is equivalent to marginal revenue keeping the other things constant so the price should be less in the competitive market as compared to the monopoly because in the competitive markets it face perfectly elastic demand but in the monopoly it face the down ward sloping demand curve

Therefore the option a is correct

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