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1 [1] (Updated May 1, 2025)

handle is hein.crs/antlwanin0001 and id is 1 raw text is: Congressional Research Servce Inforrning the legislative debate since 1914 Updated May 1, 2025 Antitrust Law: An Introduction Recent years have witnessed a resurgence of both public and political interest in antitrust. This In Focus provides an overview of the key federal antitrust statutes and their enforcement. The Goals of Antitrust The federal antitrust laws seek to protect economic competition. In contemporary doctrine, this emphasis on competition denotes a focus on the welfare benefits that result from competitive markets. The view that antitrust should be concerned exclusively with these welfare goals is often referred to as the consumer welfare standard, though there are disagreements about that term's meaning and whether various versions of the consumer welfare standard accurately reflect current legal doctrine. Issues in these debates include the extent to which consumer benefits can offset harms to input suppliers, the extent to which efficiencies captured by producers can offset harms to consumers, and the relationship between harm to the competitive process and harm to economic welfare. Abstracting from these disputes, the consumer welfare standard can be understood as an alternative to theories that endorse the use of antitrust to pursue social and political goals other than economic welfare. Despite recent efforts to revive such goals, non-welfarist considerations exert little influence on the disposition of contemporary antitrust litigation. Antitrust cases generally turn on whether the conduct or transaction at issue enables the exercise of market power in ways that diminish consumer welfare, total welfare, or innovation. The Key Antitrust Statutes The Sherman Act Section 1 of the Sherman Act prohibits restraints of trade that restrict competition unreasonably. A few categories of agreements, such as price fixing between competitors not engaged in joint productive activity, are per se illegal under Section 1. Most agreements, however, are evaluated under a standard called the rule of reason, which requires fact-specific inquiries into a defendant's market power and an agreement's effects on competition. Examples of agreements that may trigger scrutiny under Section 1 include exclusivity clauses, tying arrangements, and information-sharing agreements among competitors. Section 2 of the Sherman Act prohibits monopolization, attempts to monopolize, and conspiracies to monopolize. Unlike Section 1, which applies only to agreements, Section 2 extends to unilateral conduct. Under Section 2, the acquisition and maintenance of monopoly power are not by themselves illegal. Rather, unlawful monopolization entails (1) the possession of monopoly power (typically inferred from a market share of at least 60% and substantial entry barriers) and (2) exclusionary conduct, meaning conduct that excludes rivals through means other than a superior product or business acumen. Examples of conduct that may trigger scrutiny under Section 2 include exclusivity clauses, tying arrangements, predatory pricing, and refusals to provide rivals with essential inputs. The Clayton Act Section 7 of the Clayton Act prohibits mergers and acquisitions that may substantially ... lessen competition or tend to create a monopoly. Merger law distinguishes between horizontal mergers involving competitors and vertical mergers involving firms in the same supply chain. Horizontal mergers can raise two primary types of concerns. First, horizontal mergers may facilitate tacit or express collusion by increasing market concentration. Second, horizontal mergers may allow a firm unilaterally to increase its prices or decrease the quality of its products by eliminating competition between close substitutes, regardless of whether overall changes in market concentration are problematic. In its 1963 decision in United States v. Philadelphia National Bank, the Supreme Court recognized a presumption of illegality for horizontal mergers that result in a firm controlling an undue percentage share of the relevant market while significantly increasing market concentration. The Department of Justice (DOJ) and Federal Trade Commission (FTC) have attempted to give greater specificity to this structural presumption in merger guidelines, which utilize a measure of market concentration called the Herfindahl-Hirschman Index (HHI). The HHI is calculated by squaring the market share of each firm in the relevant market and summing the results. Thus, a market consisting of four firms with market shares of 30%, 30%, 30%, and 10% would have an HHI of 2,800 (302 + 302+ 302+ 102). The 2023 Merger Guidelines provide that the structural presumption is triggered by mergers that would result in an HHI exceeding 1,800 and an HHI increase of more than 100. The structural presumption can be rebutted-for example, with evidence that market shares do not reflect a merger's likely competitive effects, that the entry of other firms will discipline any pricing power, or that the merger will produce efficiencies that offset any anticompetitive effects. Upon rebuttal of a primafacie case, the burden of producing further evidence of anticompetitive harm shifts back to the plaintiff and merges with the burden of persuasion. The antitrust agencies challenge vertical mergers less frequently than horizontal mergers because vertical mergers do not eliminate direct competitors. Vertical integration may also generate efficiencies-for example, by allowing a firm to access inputs at cost instead of paying a markup, https://crsreport