list four industries that would be considered an oligopoly. what percentage of industry output is produced by each of the four largest forms?

CHAPTER 14 Oligopoly and Strategic Behavior | 263 TABLE 14.1 Percentage of Output Produced by Firms in Selected High-Concentration U.S. Manufacturing Industries (2) (2) Percentage of (3) Percentage of (3) Industry Output* Herfindahl Industry Output' Herfindahl (1) Produced by the Index for the (1) Produced by the Index for the Industry Four Largest Firms Top 50 Firms Industry Four Largest Firms Top 50 Firms Household laundry Primary aluminum 74 2,089 equipment 100 ND Tires 73 1,531 Household refrigerators and freezers 93 ND Bottled water 71 1.564 Cigarettes 88 2,897 Gasoline pumps 70 1,611 Beer 88 3,561 Bar soaps 70 2,250 Glass containers 86 ND Burial caskets 69 1.699 Phosphate fertilizers 67 85 3,152 Printer toner cartridges 1.449 Small-arms ammunition 84 2,848 Alcohol distilleries 65 1.394 Electric light bulbs 84 3,395 Turbines and generators 61 1.263 Aircraft 80 3,287 Motor vehicles 60 1.178 79 2,333 Primary copper 50 879 Breakfast cereals Aerosol cans 75 1,667 "As measured by value of shipments. Data are for 2012. See www.census.gov/programs-surveys/economic-census.html. "ND = not disclosed. Source: Census of Manufacturers. U.S. Census of Bureau, 2012