That's only if you rig it by choosing the market to make it turn out that way. They aren't a monopoly in every market they are in. They're monopolies in specifi

That's only if you rig it by choosing the market to make it turn out that way. They aren't a monopoly in every market they are in. They're monopolies in specific markets. No company has ever been a monopoly in general, except perhaps the Soviet state but even that isn't strictly true. Search? Google. Online retail? Amazon. Video hosting? Google.