International Migration in the Long-Run: Positive Selection, Negative Selection and Policy
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Most labor scarce overseas countries moved decisively to restrict their immigration during the first third of the 20th century. This autarchic retreat from unrestricted and even publicly-subsidized immigration in the first global century before World War I to the quotas and bans introduced
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美国国家经济研究局创建时间：
2004-05-01
