oligopolistic industry 5.1 The following table represents the market share percent- age for each firm in a hypothetical industry. G H Firm E A B C D F 10 19 11 Market Share 15 6 12 7 20 a. Calculate the four-firm concentration ratio for this industry. b. Calculate the Herfindahl-Hirschman Index (HHI) for this industry. c. Would the Justice Department consider this industry as unconcentrated, moderately concentrated, or concen- trated? Why