This paper presents the duality theory of a class of spatial price equilibrium models characterized by the assumption that the net supply of firms, households, and transport agents can be described by set-valued correspondences, which are subdifferential mappings of convex functions. If the...

Five cross sections of international trade data are analyzed by means of a gravity model in order to measure the impact of geographical distance, preferential agreements, language similarities, historical ties, and exchange rate volatilities on the pattern of world trade. The model is derived as...