Antitrust and Monopolies
Having a monopoly isn't actually illegal in the United States — what gets a company in legal trouble is what it does with that power once it has it.
Cheat Sheet
- The Sherman Antitrust Act (1890) was the first major U.S. federal law targeting monopolies and anticompetitive business practices.
- Standard Oil's 1911 court-ordered breakup into 34 separate companies remains one of the most famous antitrust enforcement actions in U.S. history.
- A monopoly itself is not automatically illegal in the U.S. — antitrust law generally targets the abuse of monopoly power to unfairly harm competition.
- 'Predatory pricing,' temporarily selling below cost to drive out competitors before raising prices again, is a commonly cited anticompetitive tactic.
- Major modern antitrust cases have targeted large technology companies over concerns about market dominance in search, app stores, and digital advertising.
- Antitrust enforcement can result in remedies ranging from fines and behavioral restrictions to a full corporate breakup, as seen historically with AT&T in 1984.
The 60-Second Version
Antitrust law aims to prevent companies from gaining or abusing excessive market power in ways that unfairly harm competition and, ultimately, consumers, with its foundation in the U.S. tracing back to the Sherman Antitrust Act of 1890, the first major federal legislation targeting monopolies and anticompetitive practices. One of the earliest and most famous enforcement actions under that law came in 1911, when Standard Oil was broken up by court order into 34 separate companies, a case that remains a reference point for major antitrust action to this day. A common point of confusion is that simply being a monopoly isn't automatically illegal under U.S. law at all, since antitrust enforcement generally targets specific abuses of monopoly power rather than large market share by itself, focusing on tactics like predatory pricing, temporarily selling below cost specifically to drive competitors out of business before raising prices again once the competition is gone. This same legal framework has stayed active well into the modern era, with major antitrust cases in recent years targeting large technology companies over concerns about dominance in areas like online search, app store policies, and digital advertising markets. When antitrust enforcement does succeed, the resulting remedies can range from financial penalties and specific behavioral restrictions all the way up to a full corporate breakup, a remedy famously applied to AT&T in 1984 decades after Standard Oil's earlier breakup.
The Long Version
Preventing Unfair Market Power
Antitrust law exists to prevent companies from gaining or abusing excessive market power in ways that unfairly harm competition and, ultimately, consumers, with its legal foundation in the United States tracing back to the Sherman Antitrust Act of 1890, the first major federal legislation specifically targeting monopolies and anticompetitive business practices.
The Case That Set the Precedent
One of the earliest and most famous enforcement actions taken under that law came in 1911, when Standard Oil was broken up by court order into 34 separate companies, a landmark case that remains a widely cited reference point for major antitrust enforcement to this day, more than a century later.
Monopoly Isn't Automatically Illegal
A common point of confusion is that simply holding a monopoly position isn't automatically illegal under U.S. law at all, since antitrust enforcement generally targets specific abuses of that monopoly power rather than large market share by itself, focusing particularly on tactics like predatory pricing, temporarily selling below cost specifically to drive competitors out of business before raising prices back up once the competition has been eliminated.
Still Active in the Modern Economy
This same legal framework has remained genuinely active well into the modern era, with major antitrust cases in recent years targeting large technology companies over concerns about market dominance in areas like online search, app store policies, and digital advertising. When antitrust enforcement does succeed, the resulting remedies can range from financial penalties and specific behavioral restrictions all the way up to a full corporate breakup, a remedy famously applied to AT&T in 1984, decades after Standard Oil's earlier, equally consequential breakup.
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Why People Care
Antitrust law directly shapes how much power any single company can accumulate in a given market, and understanding both its history and its modern application to major technology companies helps make sense of some of today's highest-profile corporate legal battles.
Glossary
- Sherman Antitrust Act
- An 1890 U.S. federal law and the first major legislation targeting monopolies and anticompetitive business practices.
- Monopoly power
- A company's ability to control prices or exclude competition in a given market, distinct from simply having a large market share.
- Predatory pricing
- A practice of temporarily selling below cost to drive competitors out of a market before later raising prices.
- Corporate breakup
- An antitrust remedy that splits a company into multiple independent entities, historically used against Standard Oil and AT&T.
- Market dominance
- A company's outsized influence or control within a specific market, a central concern in modern antitrust cases against large tech firms.
Go Deeper
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