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. instructions: enter your answers as a whole number. a. if the firm is operating as a natural monopoly, what is the profit-maximizing level of output and price charged to consumers? $ and units will be sold b. at what price would the firm earn a normal profit? $ c. suppose the government regulated the monopoly such that it were required to charge the perfectly competitive price. what is the regulated price? $ d. at the perfectly competitive price, the firm would be earning: multiple choice a normal profit. an economic profit. an economic loss.