Q P TR MR MC Profit TC 12 0 60 54 15 1 2 3 48 42 21 30 42 57 4 36 30 5 The chart above summarizes the demand curve and total cost function faced by a firm with market power. The marginal revenue of the second unit of output is and the marginal cost of the second unit of output is 48:42 48:21 96:21 42:6