Antitrust and competition policy

Markets do not police themselves. Antitrust and competition policy is the body of law and enforcement that tries to keep them competitive, against the constant pull toward monopoly.

Antitrust, or competition policy, is the body of law and enforcement aimed at preventing anti-competitive conduct and preserving competitive markets. It targets the abuses, monopoly power, collusion, mergers that reduce competition, by which firms suppress rivalry, and it rests on the premise that competition delivers benefits that markets, left to themselves, would not reliably protect.

What it targets

Competition policy concerns itself with several main harms. It prohibits cartels and collusion, where competitors agree to fix prices or carve up markets. It restrains the abuse of a dominant position, where a powerful firm uses its market power to exclude rivals or exploit customers, through predatory pricing, anti-competitive tying, or foreclosing competitors. And it reviews mergers and acquisitions, blocking or conditioning those that would concentrate a market enough to harm competition. Across all three, the aim is to keep markets contestable and rivalry alive.

Why competition is protected

The case for competition policy is that competition produces benefits worth protecting: lower prices, higher quality, more choice, and stronger incentives to innovate and cut costs, the discipline that keeps firms serving customers rather than exploiting them. Monopoly and collusion, by contrast, bring higher prices, restricted output, and slackened innovation. Because individual firms have every incentive to escape competition, by colluding, merging, or excluding rivals, and none to preserve it, the task of safeguarding competition falls to public policy.

The hard judgements

Competition policy is full of genuinely difficult judgements, because the conduct it polices often resembles the competition it protects. Low prices may be healthy competition or predation; a merger may bring efficiencies or market power; a dominant firm's aggressive tactics may be vigorous competition on the merits or exclusionary abuse. Enforcement must distinguish the beneficial from the harmful without chilling the former, and it must do so amid debates about its proper goals, whether to focus narrowly on consumer prices or more broadly on market structure, fairness, and the concentration of economic power. The rise of digital platforms has reopened many of these questions.

Antitrust and competition policy is the framework through which societies try to secure the benefits of competitive markets against the constant tendency toward concentration and collusion. Its difficulty lies in the fine and contested line between the competitive conduct it exists to encourage and the anti-competitive conduct it exists to stop, which is why it remains one of the most technical, consequential, and debated areas of economic law.