MC Price and cost dollars per unit) 5 10 15 20 25 30 35 40 45 50 Quantity (units per doyl The above figure shows the cost curves for a perfectly competitive firm. If all firms in the market have the same cost curves and the price equals $16 per unit Select one: O a. over time, the price will fall as new firms enter the market. O b. the market is in its long-run equilibrium. O cover time, firms will leave this market. O d. the firm is making zero economic profit