What Is Antitrust?

What is antitrust?

Antitrust is the set of laws that keep markets competitive, so a few large firms cannot control what you pay, what you earn, or what suppliers get paid. When competition works, a company that overcharges loses customers to a rival. When a few firms dominate, that pressure disappears.

The word comes from the 1800s. Monopolies back then were organized as legal “trusts,” and the laws were written to bust them. The first one, the Sherman Act, passed in 1890. Most explainers stop at the legal definition. This one follows the power. A handful of firms now control beef, eyeglasses, airlines, hospitals, and search, and that control reaches your receipt and your paycheck.

The Three Laws That Govern Competition

Three federal laws do the work. They are short, old, and broad. Courts and two agencies, the Federal Trade Commission and the Justice Department, decide what they mean in practice.

The Sherman Act got its first big test in 1911. The Supreme Court found the Standard Oil Trust had illegally cornered the oil market and ordered it broken into more than 30 companies. Congress passed the Clayton Act and the FTC Act three years later because the Sherman Act alone caught monopolies only after they had already formed. The Clayton Act let regulators stop a dangerous merger before the damage was done.

A Few Firms Control the Things You Buy Every Week

Market concentration is when a small number of firms hold most of an industry. It has climbed across the economy since 1980. The pattern is easiest to see in things you buy without thinking about it.

In three everyday markets, four or fewer firms hold most of the sales.

The eyewear case shows how invisible this gets. EssilorLuxottica makes the frames, owns the brands, runs the stores, and sells the insurance. Buy Ray-Ban or Oakley sunglasses, get an eye exam at LensCrafters or Pearle Vision, shop at Sunglass Hut, or use an EyeMed plan, and the money lands at the same company. A $32 billion merger in 2018 built that chain.

Beef tells a sharper story because the share moved so fast. In 1980, the four largest beef packers handled 36% of cattle. Today Tyson, Cargill, JBS, and National Beef handle about 85%. In much of the country a rancher has only two or three buyers for a herd. The same pattern runs through airlines, where four carriers control about two-thirds of domestic flights, and hospitals, where local systems have merged until many towns have one.

How Concentration Shows Up on Your Receipt

When competition fades, firms can charge more without losing customers. Economists measure this as the markup, the gap between what a product costs to make and what it sells for. That gap has been widening for 40 years.

The average markup nearly tripled from 1980 to 2020, and the increase came almost entirely from the largest firms.

The markup study found the median firm barely changed. The rise was concentrated at the top, among the dominant firms in each industry. That is what market power looks like in the data. A company with no close rival can hold its price above cost and keep the difference.

Concentration also squeezes the people who supply these firms. Farmers and ranchers received 5.8 cents of every dollar Americans spent on food in 2024. When four packers are the only buyers for a region’s cattle, the rancher takes the price offered. The buyer sets the terms on both ends, low to the supplier and high to you.

How Concentration Holds Down Your Pay

Antitrust is not only about prices. The same firms that sell to you also hire you. When a few employers dominate the jobs in an area, they gain power over wages the same way they gain power over prices.

Economists call this monopsony, too few buyers of labor. The effect is large. Across the research, employer market power suppresses wages by 15% to 50% in the most concentrated job markets. Pay would rise by that much if workers had real choice in where to work.

Noncompete clauses make this worse. They bar a worker from taking a job at a rival, which removes the threat that keeps wages honest. The FTC tried to ban most noncompetes in 2024. A federal court struck the rule down later that year, and the agency dropped its appeal in 2025. The clauses remain legal in most states.

Why Enforcement Went Quiet for 40 Years

Antitrust enforcement is not a steady line. It swings between two ideas about what the law is for. The arc below runs from the trust-busting era, through a 40-year retreat, to a recent revival and the legal fights now underway.

1890 to 1970s, the trust-busting era. The government broke up Standard Oil in 1911 and the AT&T phone monopoly in 1984. Bigness alone could draw a lawsuit if a firm dominated a market.

1978, the consumer-welfare turn. Robert Bork published The Antitrust Paradox, arguing that the only thing antitrust should measure is whether a deal raises prices for consumers. Courts adopted it. If a merger did not obviously raise prices, it was allowed. Harm to workers, suppliers, or competition itself did not count.

2010s, the merger wave. Under the price-only test, regulators cleared most mergers. This is the period when beef, eyewear, airlines, and hospitals consolidated into a few hands.

2021, the revival. FTC chair Lina Khan and DOJ antitrust chief Jonathan Kanter rejected the price-only standard. They argued it missed the wage and supplier harms above. The FTC issued new merger guidelines and took on Big Tech directly.

2025, the turnover. Khan and Kanter left office. The agencies kept some of the Big Tech cases but returned to a more business-friendly posture on mergers.

The Big Antitrust Cases Happening Now

The revival produced the largest antitrust cases in a generation. Several are still in court in 2026. The results so far are mixed, and they will shape what a few firms can do for years.

The Google ruling is the landmark. In August 2024, Judge Amit Mehta found that Google held an illegal monopoly in search and used it to lock out rivals, partly by paying Apple billions to be the default on iPhones. In September 2025 the judge ordered remedies. Google cannot sign exclusive default-search contracts and must share some data with competitors. The court declined to force a Chrome breakup.

The blocked mergers matter as much as the wins in court. Kroger and Albertsons would have been the largest grocery merger in US history. A federal judge stopped it in December 2024, and the companies walked away. The same year, a judge blocked JetBlue’s purchase of Spirit on the grounds that it would raise fares. The Meta loss in 2025 shows the limit. A judge ruled the FTC had not proven Meta holds a monopoly today, and the agency is appealing.

What Stronger Competition Policy Looks Like

The tools to restore competition already exist. The question is whether agencies use them and whether Congress funds the effort. Reform runs along four lines.

• Merger review with teeth. The Clayton Act lets regulators block deals that would harm competition. The 2023 FTC and DOJ merger guidelines made that review tougher. Blocking Kroger-Albertsons and JetBlue-Spirit shows it works when agencies act.
• Breakups in extreme cases. Standard Oil and AT&T were split when no lighter remedy would restore competition. The Google remedy stopped short of a breakup, which is the debate now over how far to go.
• Banning noncompetes. Freeing workers to take a better job is one of the most direct ways to raise wages in concentrated job markets. The FTC’s 2024 rule was struck down, so this fight has moved to Congress and the states.
• Funding the agencies. The FTC and the DOJ Antitrust Division take on companies with unlimited legal budgets. Without staff and money, the laws on the books go unenforced.

Big Is Not Always Bad

Antitrust is a tool, not a verdict on size. The law asks whether a firm harmed competition, not whether it is large. A fair view holds several things at once.

• Scale can lower prices. Costco and Amazon pass real savings to customers through volume. A big company that earns its position by serving people better is not the problem.
• Some dominance comes from a better product. Google won search in part because it worked. The legal question is whether it then used that position to block rivals, which the court found it did.
• The consumer-welfare standard had a point. It gave courts a measurable test, prices, instead of a vague rule that bigness is bad. The critique is that prices miss harms to workers and suppliers, not that prices do not matter.
• Antitrust is not one party’s issue. The Google case began under the first Trump administration in 2020 and was won under Biden. The current FTC kept several Big Tech suits.
• Not every merger is bad. A merger can rescue a failing firm or fund a better product. The law judges the specific deal and its effect, not mergers in general.

Frequently asked questions

What are the big three antitrust laws? The Sherman Act (1890), the Clayton Act (1914), and the FTC Act (1914). Sherman bans monopolies and price-fixing. Clayton blocks anticompetitive mergers before they form. The FTC Act bans unfair competition and created the Federal Trade Commission.

Why is it called “antitrust”? In the 1800s, monopolies were organized as legal “trusts,” like the Standard Oil Trust. The laws were written to break the trusts, so they became known as antitrust laws.

What is an example of an antitrust violation? Competitors secretly agreeing to fix prices is the clearest one. So is a dominant firm signing deals that lock rivals out of the market, which is what a court found Google did in search. Mergers that would leave a market in too few hands, like Kroger-Albertsons, can also violate the law.

Who enforces antitrust law? Two federal agencies, the Federal Trade Commission and the Justice Department’s Antitrust Division. State attorneys general and private companies can also sue. Many of the biggest recent cases joined federal and state enforcers together.

Does antitrust law cover wages, not just prices? It can. Suppressing wages through employer market power or no-poach agreements between companies can violate antitrust law. This was a focus of enforcers from 2021 to 2025 and remains contested in court.

What you can do

1. Tell your representatives to fund the FTC and DOJ Antitrust Division. These agencies fight companies with unlimited legal budgets. Budget cuts are how enforcement dies quietly. Use the letter and call script below.

2. Support stronger merger review. The 2023 merger guidelines made it harder to push through deals that raise prices and cut wages. Ask your members of Congress to defend them, not roll them back.

3. Back a federal noncompete ban. With the FTC’s rule struck down, the fight is in Congress and the states. If your job is covered by a noncompete, your representatives should hear about it.

4. Follow the concentration in your own life. Open Markets Institute tracks which firms control which industries. The American Antitrust Institute covers the live cases. When one company owns every brand on the shelf, that is the story.