Antitrust refers to a field of economic policy and laws dealing with monopoly and monopolistic practices. Antitrust law or antitrust policy are terms primarily used in the United States, while in many other countries the terms competition law or policy are used. Some countries have utilized the phrases Fair

Trading or Antimonopoly law. The intellectual basis for antitrust economics or policy is the sub-field of industrial organization economics which addresses issues arising from the behaviour of firms operating under different market structure conditions and the effect this has on economic performance. Most antitrust or competition laws have provisions dealing with structure such as mergers, monopoly, dominant market position and concentration, as well as behaviour, such as collusion, price fixing, and predatory pricing.

Source: OECD