這裏有個很好的解釋
【Intergenerational Social Mobility: The United States in Comparative Perspective】
http://www.princeton.edu/futureofchildren/publications/docs/16_02_02.pdf
這裏有個很好的解釋
【Intergenerational Social Mobility: The United States in Comparative Perspective】
http://www.princeton.edu/futureofchildren/publications/docs/16_02_02.pdf
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