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The authors "argue that national variation in the size of highly trained migration can be explained by interaction and inequality between nations, both reflecting the process of global integration. Guided by this analytical framework, we tested the structural determinants of highly skilled migration to the United States. The evidence confirms our hypotheses that economic and educational interactions between sending countries and the United States increase the flow of the highly trained to the United States. Results also provide mixed proof for our hypotheses that levels of professional migration are positively associated with disparities between sending countries and the United States in living conditions, research conditions, children's educational opportunities, political conditions, and professional employment opportunities."
Cheng et al. (Tue,) studied this question.