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From 2005 to 2013, major international banks — including Barclays, Citigroup, JPMorgan, and Deutsche Bank — coordinated the manipulation of LIBOR and foreign exchange benchmark rates through chat room agreements. Traders shared upcoming client orders, agreed to move rates in favorable directions, and divided profits from the manipulation. The DOJ and FTC investigations that followed resulted in over $9 billion in fines and criminal convictions — a textbook illustration of collusion operating at the center of global financial markets, exposed and prosecuted.
In plain terms
Collusion is coordination between competing firms to limit competition — through price-fixing, output restriction, geographic market division, or customer allocation. A cartel is a formalized collusive agreement: firms operating as a coordinated group, setting joint prices or output quotas to maximize collective profit as if they were a single monopolist.
The economic effect is predictable: colluding firms produce less and charge more than competitive firms. The cartel price is the monopoly price — set where joint MR = MC, above the competitive level. Consumer surplus is transferred to producers, and deadweight loss is created. The DOJ's antitrust enforcement record shows that prosecuted cartels typically raised prices 10–40 percent above competitive levels for years or decades before detection.
Why it works this way
Collusion is attractive because it converts competitive markets into near-monopoly profitability. OPEC's explicit output quota system is the most visible legal cartel — not subject to U.S. antitrust jurisdiction but facing the same economic dynamics. The Energy Information Administration's OPEC production data shows oil prices consistently above competitive levels when quotas hold, and collapsing toward marginal cost when members defect.
Hard-core price-fixing — explicit agreements among competitors to set prices — is treated as per se illegal under Section 1 of the Sherman Act: no efficiency justification, no market power threshold required. The Department of Justice prosecutes these criminally, with penalties including imprisonment for individual executives.
Where you see it in the wild
The most significant U.S. cartel cases of the past three decades include LCD panel price-fixing (Samsung, LG, AU Optronics — price-fixed panels for televisions and monitors globally), auto parts collusion (multiple Japanese suppliers fixing prices for airbags, wire harnesses, and other components sold to U.S. automakers), and the Archer Daniels Midland lysine cartel immortalized in the film The Informant. The DOJ's criminal division antitrust prosecutions document the scope and penalties across industries.
The fix (or why it's hard to fix)
Cartels face a fundamental stability problem: each member profits by secretly defecting — selling more than the agreed quota or shading price slightly to attract customers. This Prisoner's Dilemma structure means that without an enforcement mechanism, cartels unravel. Antitrust law exploits this instability through leniency programs: the first cartel member to report the agreement to DOJ gets immunity, creating a race to defect and report. The DOJ's Corporate Leniency Policy has been credited with dramatically increasing cartel detection and prosecution since the 1990s.
