摘要: In this paper, we analyse the geographic concentration of economic activities within framework a two countries and four regions model. Trade both between entails transport costs which are differentiated according to interregional or international nature flows. Allowing for regional migration population, model configures equilibra systems as key parameters change. The results obtained suggest that types transaction affect incentive firms cluster geographically. Consequently, processes integration nations such one taking place through constitution European Union is identified factor possibly favoring emergence agglomeration.