U.S. corn exports continue to dominate the world coarse grain market with little change in U.S. market share. The lack of gains in the U.S. share over the past few decades has renewed interest in the question of whether corn cleaning would help the competitiveness of U.S. grain. Mandating cleaner corn under current production and marketing practices would have little appreciable effect on the market share or value of U.S. corn exports. The bottom line is that the world corn market is functioning fairly well, based on importers’ knowledge of the type and the characteristics of corn they generally receive from various exporters. This study focuses on the function of quality in the import decisionmaking process, particularly as it relates to the cleanliness of corn.