The Returns to Skill in the United States across the Twentieth Century
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Economic inequality is higher today than it has been since 1939, as measured by both the wage structure and wealth inequality. But the comparison between 1939 and 1999 is largely made out of necessity; the 1940 U.S. population census was the first to inquire of wage and salary income and education.
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美国国家经济研究局创建时间：
1999-05-01
