Abstract
This paper examines whether “geographic scale economies” explain the trade that remains unexplained by the Heckscher–Ohlin model. The paper develops a theoretical specification that integrates geographic scale economies into the Heckscher–Ohlin model, and develops a statistical method for detecting geographic scale economies in the distributional features of a disturbance term. The units of analysis are US states. The findings reveal that empirical support for the Heckscher–Ohlin theory is improved by accounting for geographic scale economies within states; geographic scale economies do not generate differences in Rybczynski effects across states; and the scope of geographic scale economies is contained within states.
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