The output supply elasticity indicates the responsiveness of output to a relative price change. When output is very responsiveness to a relative price change, indicating curvature on the production possibilities frontier, there is potential for large migration flows. The output supply elasticity for corn, a sector which contracts under NAFTA, is 1.09. This slightly elastic supply curve and the dramatic price shock under NAFTA contribute to the large migration of workers out of Mexico’s rural labor markets.