Intergenerational Occupational Mobility in Great Britain and the United States Since 1850: Comment
批评了Long和Ferrie关于美国社会流动性下降的研究，指出其数据质量有限且方法不适合衡量农民流动性，导致结论有误。
Using historical census and survey data, Long and Ferrie (forthcoming) found a significant decline in social mobility in the United States from 1880 to 1973. We present two critiques of the Long-Ferrie study. First, the data quality of the Long-Ferrie study is more limiting than the authors acknowledge. Second, and more critically, they applied a method ill-suited for measuring social mobility of farmers in a comparative study between 1880 and 1973, a period in which the proportion of farmers dramatically declined in the U.S. We show that Long and Ferrie's main conclusion is all driven by this misleading result for farmers.