U.S. NORTH‐SOUTH LABOR MIGRATION AND TRADE*
研究了美国南北劳动力迁移与商品贸易在区域实际工资均等化中的作用，基于1960和1970年人口普查及1963年多区域投入产出数据，发现贸易隐含的劳动力流动模式与直接劳动力迁移模式高度相似。
The authors examine the roles of labor migration and commodity trade in the inter-regional equalization of the real wage rate in the United States. The emphasis is on North-South patterns. Theoretical models are first outlined and then tested using 1960 and 1970 census data and multi-regional input-output data for 1963. It is found that "the pattern of trade-embodied labor flow closely resembled the pattern of direct labor migration." It is also noted that "the South's hierarchical profile of relative plentifulness among age, education, and race-specific categories of work force tended to persist and remain fairly stable between 1960 and 1970.... One plausible hypothesis is that interregional commodity trade is accomplishing the bulk of the requisite adjustment in bringing about the real wage equalization."