Question

The competitive firm's supply curve is equal to A. the portion of its marginal cost curve that lies on and above AFC. B. its marginal cost curve. C. the portion of its marginal cost curve that lies on and above AC. D. the portion of its marginal cost curve that lies on and above AVC.

Answer 1

a. the portion of its marginal cost curve that lies above the AVC

Step-by-step explanation:

In short run, a perfectly competitive produces as long as its price is above its AVC, so revenues can cover total variable cost. If price is below AVC, the firm has to shut down. Since such a firm maximizes profit by equating Price with MC, this condition means that firm's supply curve is its MC curve lying above the (minimum point of) AVC curve.