If the firm should increase output when MR > MC and decrease when MR < MC, then the firm can only be in equilibrium when MR = MC . Anytime these two aren't equal, the firm can increase its profitability by changing its behavior.
A typical marginal cost curve is shown to the right. We have learned that for a single perfectly
competitive firm the demand curve is also the marginal revenue curve, and that demand and marginal revenue are equal to market price.
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