appeals, the U.S. Supreme Court held that the broader market definition was more appropriate, and it dismissed the

case against DuPont.

Questions over how to define the market continue today. True, Microsoft in the 1990s had a dominant share of the
software for computer operating systems, but in the total market for all computer software and services, including

everything from games to scientific programs, the Microsoft share was only about 14% in 2014. The Greyhound bus

company may have a near-monopoly on the market for intercity bus transportation, but it is only a small share of the

market for intercity transportation if that market includes private cars, airplanes, and railroad service. DeBeers has a

monopoly in diamonds, but it is a much smaller share of the total market for precious gemstones and an even

smaller share of the total market for jewelry. A small town in the country may have only one gas station: is this gas
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