Merchants pay fees to debit card networks (called “swipe” or “interchange” fees) each time a consumer uses a card. In 2010, the Durbin Amendment capped debit card interchange fees in the United States. On October 26, the 8th Circuit Court of Appeals ruled that the Federal Reserve exceeded its authority by including costs such as a share of expected fraud losses as part of interchange fees, thus setting the cap too high. In 2025, a district court in Kentucky had upheld the Fed’s rule: if the Sixth Circuit upholds the Kentucky court, the conflict between the circuits could reach the Supreme Court.
The legal details—including the courts’ disquisitions on economic theory and comma placement—though interesting, are a distraction: the real problem is that the Durbin Amendment is a misadventure in price controls. Price controls on financial services harm consumers, for the same reasons that price controls on gasoline or fire insurance harm consumers. When regulators force prices down, firms react by raising other prices or by cutting services or service quality.