The Robinson–Patman Act (RPA) of 1936 (or Anti-Price Discrimination Act, Pub. L. No. 74-692, 49 Stat. 1526 (codified at 15 U.S.C. § 13)) is a United States federal law that prohibits anticompetitive practices by producers, specifically price discrimination.
Co-sponsored by Senator Joseph T. Robinson (D-AR) and Representative Wright Patman (D-TX), it was designed to protect small retail shops against competition from chain stores by fixing a minimum price for retail products. Specifically, the law prevents suppliers, wholesalers, or manufacturers from supplying goods to "preferred customers" at a reduced price. It also prevents coercing suppliers into restrictions as to whom they can and can't sell goods. This means that it is illegal for a supplier to sell one truckload of goods at a steep discount to a large business, such as Walmart or Amazon, and then charge a substantially higher price for a truckload of identical goods to a small business, such as a local grocery store.