The following graph depicts the demand (D), marginal revenue (MR), marginal cost (MC), and average total cost (ATC) curves for a firm operating as a natural monopoly Market for a Natural Monopoly 80 70 MC 60 50 Costs and Revenues (dollars) ATC 40 30 20 10 MR . 10 20 30 40 50 60 70 80 90 100 Quantity a. If the firm is operating as a natural monopoly, what is the profit-maximizing level of output and price charged to consumers? 40 and 55 units will be sold c. Suppose the government regulated the monopoly such that it were required to charge the perfectly competitive price. What is the regulated price? $1 d. At the perfectly competitive price, the firm would be earning Oo normal profit O an economic profit an economic loss