Selling commodities in a foreign market at a lower price than in the domestic market. Under World Trade Organization rules, dumping occurs when the price to the importer is less than the normal price of the product charged to the buyer in the country of origin. When considering the imposition of an antidumping duty, the U.S. government examines the imported price of a product compared to its domestic price. In addition, before duties are imposed, proof of injury to a U.S. industry must be demonstrated.