Answer:
C) A firm's marginal cost curve is equal to its supply curve for prices above average variable cost
Explanation:
A perfectly competitive firm maximizes its profit when its marginal cost = marginal revenue. In the short run, it will continue to produce even if the marginal revenue is lower than its marginal costs, as long as the marginal costs are ≥ average variable costs.
Therefore, all perfectly competitive firms should supply products or services following its marginal cost curve as long as the price ≥ average variable costs.
