Following the empirical work of Jones (1995a,b) that test the scale effects predicted by the AK models and the R&D based models, this paper tests the scale effects of a major new trade model, the Krugman (1979) version of the Dixit-Stiglitz (1977) model, using the Yang-Heijdra (1993) formula for...

Almost twenty-five years after the appearance of Dixit and Stiglitz’s paper on monopolistic competition and optimum product diversity, I try to take stock of the progress which has been made in applying their approach to international trade theory. I review the principal applications to trade...