Question 1). Suppose the demand curve for a monopolist is Qd = 500 - P, and the marginal revenue function is MR = 500 - 2Q. The monopolist has a constant marginal and average total cost of $50 per unit.
a). Find the monopolist's profit-maximizing output and price.
b). Calculate the monopolist's profit.
c). What is the Lerner index for this industry?
Question 2). The top four firms in Industry A have market shares of 30, 25, 10, and 5 percent, respectively. The top four firms in Industry B have market share of 15, 12, 8, and 4 percent, respectively. Calculate the four-firm concentration ratios for the two industries. Which industry is more concentrated?