Manufacturing Productivity and Snowbelt-Sunbelt Shifts
研究了美国制造业生产率增长与人口就业从雪带向阳光带转移的关系，检验了弗多尔定律在空间上的适用性。
Historically, population and jobs tended to concentrate in the old industrial core regions of the United States. A reversal of this trend materialized in the mid-sixties, when some portions of the Sunbelt emerged as the major growth areas in this country. According to the Verdoorn law, productivity grows faster in economic sectors that are in the process of expanding. This paper investigates the spatial validity of the Verdoorn law and its relation to the Snowbelt-Sunbelt shifts.