History of The Theory's Development
The theory was initially associated with Paul Krugman in the late 1970s; Krugman claims that he heard about monopolistic competition from Robert Solow. Looking back in 1996 Krugman wrote that International economics a generation earlier had completely ignored returns to scale. "The idea that trade might reflect an overlay of increasing-returns specialization on comparative advantage was not there at all: instead, the ruling idea was that increasing returns would simply alter the pattern of comparative advantage." In 1976, however, MIT-trained economist Victor Norman had worked out the central elements of what came to be known as the Helpman-Krugman theory. He wrote it up and showed it to Avinash Dixit. However, they both agreed the results were not very significant. Indeed Norman never had the paper typed up, much less published. Norman's formal stake in the race comes from the final chapters of the famous Dixit-Norman book.
James Brander, a PhD student at Stanford at the time, was undertaking similarly innovative work using models from industrial organisation theory—cross-hauling—to explain two-way trade in similar products.
Read more about this topic: New Trade Theory
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