Suppose the pretzel market is perfectly competitive and in its long run equilibrium. If then there is a new process that reduces the costs for each firm in the industry, short run economic profits will be _________, though in the long run economic profit will be _____ as firms _______ the industry. Question 8Select one: a. negative, zero, exit b. zero, positive, enter c. positive, positive, neither enter or exit d. positive, zero, enter