The Herfindahl-Hirschman Index is a measure of concentration in an industry found by: O a. squaring the percentage market share of each firm in the industry. b. squaring each firm's market share summed over the firms in the industry. c. summing the percentage market shares of each firm in the industry. d. squaring the sums of the concentration ratios found in an industry survey of the largest four and largest eight firms. QUESTION 18 The practice of one company tacitly setting prices for the industry as a whole is: a. tacit collusion. b. product differentiation. O c. antitrust policy. Od. price leadership. Price, cost P ATC D MR 0 Q QQ Quantity (per period) (Figure: The Market for Specialized Lawn Care Service) Use Figure: The Market for Specialized Lawn Care Service. Assume that the market for lawn care services is characterized by many firms, differentiated products, and easy entry and exit. For a typical lawn care service, the profit-maximizing price would be: a. P1. b. P2. O c. P3. d. Not enough information is given to answer the