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Antitrust laws are laws that
seek to ensure competition in the marketplace by preventing the undue
acquisition or use of market power by one firm or a few powerful firms. The
principal American antitrust laws are the Sherman Act, Clayton Act and the
Federal Trade Commission Act. Antitrust laws can be enforced by the Department
of Justice, Federal Trade Commission or by private lawsuits.
Antitrust laws prohibit
“monopolization,” which means engaging in anticompetitive behavior to dominate
a market. One example of such behavior is “predatory pricing,” which means
selling at a loss to undersell competition and drive them from the market.
Tying a dominant product to another product to bolster the latter’s position in
the market is also often prohibited.
Mergers between large,
powerful players in markets dominated by an already small number of firms (such
as airlines or car manufacturers) can also be challenged by the Department of
Justice on antitrust grounds.
Antitrust law also forbids
“collusion,” wherein market competitors agree to set prices. Many other types
of agreements in restraint of trade are also prohibited or limited by antitrust
laws.