The question assumes a settled answer—that Mexican migration to the United States harms Mexico's economy. The economic literature tells a more nuanced story: there's no consensus that migration produces a net disadvantage for Mexico overall.
Potential downsides include "brain drain"—the loss of skilled, ambitious workers—and reduced labor supply in certain sectors. Some regions experience demographic hollowing, with aging populations left behind. Remittance dependence can create moral hazard, discouraging structural reforms.
Countervailing benefits are substantial. Remittances—$58+ billion annually (2022)—exceed oil exports and tourism combined, directly supporting millions of households, funding education, housing, and small businesses. Return migrants bring skills, capital, and transnational networks. Reduced labor market pressure can raise wages for those who stay. Diaspora communities facilitate trade, investment, and technology transfer.
Studies conflict: some find negative effects on specific sectors (e.g., agriculture in high-emigration states); others show net positive macroeconomic impacts. The World Bank and IMF generally view remittances as stabilizing—countercyclical, poverty-reducing, and resilient during crises.
The reality: migration reshapes Mexico's economy in ways that defy simple "advantage/disadvantage" framing. Outcomes depend on policy responses—whether Mexico leverages its diaspora for development or merely survives the outflow.