Establishing the link between internal and international migration: Evidence from Sub-Saharan Africa
基于21个撒哈拉以南非洲国家的数据，研究发现国内移民（尤其是迁往城市者）更可能产生国际移民意愿，这为理解国内与国际移民的关联提供了新证据。
Internal and international migration are often thought of as separate processes, rarely analysed together in a coherent framework. This paper examines, based on data for 21 Sub-Saharan African countries, how previous internal migration can shape international migration intentions – i.e. desiring and planning to move abroad. We find that individuals who migrated to urban areas are on average the most likely to develop international migration intentions, followed by those who migrated to rural areas, those who live in urban areas and have not moved internally, and lastly come rural residents who have not moved internally. This highlights the role of migration to urban areas as a potential driver of international emigration. The findings support our conceptual framework, which hypothesizes internal migrants have lower international migration costs, both monetary and non-monetary, and accumulate resources and experience that help overcome constraints related to international migration. Internal migration is also found to have a stronger association with desire to migrate abroad than with planning, indicating that weakening the attachment to place of origin may be the dominant mechanism linking internal and international migration processes.