Monopoly in a legal sense doesn't actually refer to a literal monopoly but rather a company that is in a dominate position in the market. A company in a dominate market position what uses that position to undercut competition is what the Sherman Anti-trust law was written to go after. A company that is in a dominate market position can be in trouble when it does things that might normally be considered perfectly all right. For example, it's normally fine for a company to try to squeeze it's suppliers, however when a company has a dominate market position, such as Amazon has in the book industry, then the same practice can be undue restraint of trade.
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