Tommy's Tires operates in a perfectly competitive market. If tires sellfor $60 each and average total cost per tire is $50 at the profit-maximizing output level, then in the long

run a) more firms will enter the market, and the price will fall. b) more firms will enter the market, and the price will rise. c) more firms will exit from the market, and the price will fall. d) some firms will exit from the market, and the price will rise. e) none of above