Suppose for some firm that average total cost is minimized at q1 units of output. for a monopolistically competitive firm in long-run equilibrium, q1 a. exceeds the level of output at which there is a point of tangency between the demand curve and the average total cost curve. b. exceeds the level of output at which marginal revenue equals marginal cost. c. is also the level of output at which marginal cost equals average total cost. d. all of the above are correct.