For a firm, marginal revenue minus marginal cost is equal to a Change in profit.
Option A. Change in profit:
A firm maximizes its profit when the marginal revenue is equal to the marginal cost. The difference between marginal revenue and marginal cost (Marginal revenue - marginal cost) is equal to a change in the profit. Thus, option 'c' is correct.
Marginal revenue is the profit a firm makes when it sells one more unit of its output. It is calculated as marginal revenue (i.e., the amount of revenue a firm earns from selling one additional unit of production) minus marginal cost (i.e., the cost of producing one additional unit of production).
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