A number of stores offer film developing as a service to their customers. Suppose that each store offering this service has a cost function C(q) = 50 + 0.5q + 0.08q2 and a marginal cost MC = 0.5 + 0.16q.
Q: If the going rate for developing a roll of film is $8.50, is the industry in long-run equilibrium? If not, find the price associated with long-run equilibrium.