Free Movement, Open Borders, and the Global Gains from Labor Mobility
梳理了劳动力自由流动带来全球产出大幅增长的经济学论点，考察不同模型下移民自由化对世界福利的影响，并关注收益分配及量化尝试，最后探讨非经济因素对移民限制的推动作用。
Straightforward economic arguments point to the potential for large global output gains from the movement of labor from less to more productive locations. Yet the politics of receiving countries seems resistant, characterized rather by efforts to limit migration or to stop it altogether. In this article we examine the foundations of claims of large welfare gains through free mobility, studying implications of liberalizing migration for world welfare under a variety of models, paying attention not only to overall gains but also to how gains are distributed and reviewing attempts to quantify the benefits. We conclude by asking how far considerations beyond economics motivate keenness to impose restrictions on migration.