Marginal revenue: A) is the slope of the average revenue curve. B) equals the market price in perfect competition. C) is the change in quantity divided by the change in total revenue.

B) equals the market price in perfect competition.

Explanation:

Marginal revenue can be defined as the amount of money (revenue) generated from the sales of an additional unit of a product.

In a perfectly competitive market in long-run equilibrium, a long-run equilibrium avails firms the opportunity to adjust all inputs and all fixed costs are maximized. Also, it's characterized by free entry and exit, as such there isn't a fixed number of firms. This simply means that, since the number of firms in a long-run equilibrium can change, a firm must exit the market as a result of losses i.e when the firm is unable to cover its fixed costs in the long-run while new firms are allowed entry into the market when it anticipates potential profits or gains.

Hence, marginal revenue equals the market price in perfect competition.

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