The third-pound burger is a hamburger made with a patty that weighs one-third of a pound (approximately 5.3 ounces or 150 grams) before cooking. It is larger than the more common quarter-pound burger (4 ounces or 113 grams) typically sold by fast-food chains. The third-pound burger gained notable attention in the 1980s due to an ill-fated marketing campaign by A&W Restaurants in the United States, which has since become a case study in consumer behavior and market communication.