The Sherman Act, enacted in 1890, is the cornerstone of U.S. antitrust law, prohibiting anti-competitive practices and monopolies.

Antitrust Laws aim to protect consumer rights, promote economic efficiency, and prevent market dominance, ensuring fair competition.

The Antitrust Division of the U.S. Department of Justice is the primary federal agency responsible for enforcing Antitrust Laws.

Collusion is an illegal agreement between competitors to fix prices, allocate markets, or engage in other anti-competitive practices.

A Relevant Market is defined by geographic area, industry, and product sector, and is used to assess market power and anti-competitive behavior.

The Clayton Act prohibits tying arrangements, exclusive dealing contracts, and other practices that may lessen competition.

A Monopoly is a market structure where a single entity controls a large share of the market, giving it significant market power.

The Robinson-Patman Act prohibits price discrimination and other practices that may injure competition.

An Oligopoly is a market structure where a small number of large firms control a majority of the market share.

The Hart-Scott-Rodino Antitrust Improvements Act requires companies to notify the government before engaging in certain mergers or acquisitions.

Perfect Competition is a market structure where there are many buyers and sellers, and no single entity has significant market power.

The Clayton Act prohibits mergers or acquisitions that may substantially lessen competition.

A Duopoly is a market structure where two companies control a majority of the market share.

The Clayton Act prohibits exclusive dealing contracts and other practices that may lessen competition.

A Monopsony is a market structure where there is only one buyer, giving it significant market power.