When output changes in response to a relative price change, the demand for labor also changes. For example, as the labor intensive good expands, the labor demand curve shifts to the right. If the labor demand curve is very responsive to output changes, one anticipates high levels of migration as there is initially pressure for wages to increase in that country. Focusing on corn, an important source of migration, we find that the elasticity of labor demand with respect to output is 1.44 in Mexico.