Antitrust policy aims to promote economic efficiency by preventing anti-competitive practices that can lead to market inefficiencies and harm consumers.

Duopoly is not a commonly analyzed market structure in economic regulation, as it refers to a market with only two sellers, which is a specific case of oligopoly.

Economic regulation aims to ensure fair competition in the marketplace by preventing anti-competitive practices and promoting a level playing field for businesses.

Setting price controls is not a common tool used by antitrust authorities, as it can lead to market inefficiencies and harm consumers.

Monopoly refers to a market structure where a single firm controls a significant share of the market, giving it substantial market power.

Increased economic efficiency is not a potential consequence of a monopoly, as monopolies can lead to market inefficiencies and harm consumers.

Oligopoly refers to a market structure where a small number of firms control a significant share of the market, leading to limited competition.

Creating barriers to entry for new businesses is not a potential benefit of economic regulation, as it can harm consumers and stifle innovation.

Perfect competition refers to a market structure where there are many buyers and sellers, and each firm has a negligible market share, leading to a highly competitive market.

Economic inefficiency is not a potential consequence of perfect competition, as perfect competition is characterized by efficient resource allocation.

Duopoly refers to a market structure where two firms control a significant share of the market, leading to limited competition.

Encouraging innovation is not a potential benefit of antitrust policy, as antitrust policy primarily focuses on preventing anti-competitive practices and promoting fair competition.

The Federal Trade Commission (FTC) and the Antitrust Division of the U.S. Department of Justice are the primary government agencies responsible for enforcing antitrust laws in the United States.

Patent infringement lawsuits are not common types of antitrust cases, as they fall under the jurisdiction of intellectual property law rather than antitrust law.

Predatory pricing refers to a situation where a firm with a dominant market position engages in pricing strategies aimed at driving competitors out of the market, often below cost, with the intent of establishing a monopoly.