The recent evolutions in the world economy have generated questions which prove the necessity of a new approach of the theory regarding the international commerce. In which way the price liberalization affects the localization of the economic activities and the national income in real terms? Which are the factors that make a certain zone or region to be an attraction for the production factors? Which are the determinants of the international commerce when there is a mobility of the production factors? In this case, there is a need of a theory which explains why the economic activities are concentrated in certain countries, regions, cities and how the creation of such attraction poles over the years can be stimulated.