Corn is only one product in a complex trade system. While NAFTA has undoubtedly given US corn farmers an advantage, it has also benefited Mexican avocado famers- and everyone employed in the industry1. Automobile production has shifted away from the US and towards Mexico after NAFTA2. Each country cannot expect to export more of every product- what Mexico has lost in corn production, it has gained in other areas.  1Amy Clark, "Is NAFTA good for Mexico's Farmers?," CBS, February 11, 2009.  2 Scott, Robert, Carlos Salas, and Bruce Campbell. "Revisiting NAFTA: Still Not Good for North America's Workers." Economic Policy Institute, September 28, 2006.