Corn is the most widely produced grain in the world by volume and the backbone of the US agricultural economy. Price is dominated by US supply conditions — the US produces roughly a third of global corn and accounts for the largest share of exports — with the August USDA crop production estimates being among the most market-moving data releases in commodity markets. Demand comes from three major sources: livestock feed (the largest), ethanol production (which links corn to energy prices through the renewable fuel mandate) and food and industrial uses. The ethanol connection creates an important cross-market dynamic: when oil prices are high, ethanol becomes more valuable, which supports corn demand and prices; when oil is cheap, ethanol economics deteriorate and corn demand softens. South American production, particularly Brazil's second corn crop, has become an increasingly important supply variable as Brazilian corn exports compete directly with the US in Asian markets. Drought in the US Corn Belt during the critical pollination period in July is the highest-impact weather event for corn prices. For investors, corn price matters directly for agricultural input companies, livestock producers, food manufacturers using corn-derived ingredients and ethanol producers.
