Researchers working in Mexican communities have observed both regularities and inconsistencies in the way that transnational migration develops over time. This article presents a theory that accounts for these uniformities and discrepancies and proposes a method to compara the process of migration across communities. It also argues that studies must report and control for the prevalence of migration within communities. Data from 19 Mexican communities show that predicable demographic, social, and economic changes accompany increases in migratory prevalence. Although international migration begins within a narrow range of each community's socioeconomic structure, over time it broadens to incorporate other social groups.
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