Abstract
The paper attempts to empirically quantify the factors underlying sigma convergence among the contiguous states of the U.S. Using annual state data the study finds a significant effect of the wedge in explaining the variation in state per capita productivity. Employing a time series framework, the paper finds that an increase in the variation of 1 percent in the wedge will increase the variation in per capita productivity by roughly 0.12 percent in the short run and roughly 0.45 to 0.55 percent in the long run.
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Vohra, R. The wedge and sigma convergence among U.S. states. Atlantic Economic Journal 24, 371–377 (1996). https://doi.org/10.1007/BF02298438
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DOI: https://doi.org/10.1007/BF02298438