Paul Krugman won the 2008 Nobel Prize in Economics for his analysis of trade patterns and location of economic activity.
Krugman’s work helped explain why countries and regions may trade similar goods with one another rather than specializing completely in different products. His models incorporated economies of scale, consumer variety, and imperfect competition.
He also studied economic geography: the reasons businesses and workers cluster in particular places. When production becomes more efficient at larger scale and transport costs are significant, markets can become concentrated in major centers.
Traditional trade theory often emphasized differences in resources or technology between countries. Krugman showed that increasing returns and market size could also generate important trade patterns. His research influenced both international economics and the study of cities and regions.