Abstract
This article studies how spatial heterogeneity (by urban concentration) and economic heterogeneity (by economic dualism), which are being affected by trade integration with the EU, influence the growth of European Neighbourhood Policy countries (ENPs). It is proved that urban concentration is not always related to growth. Furthermore, the eastern and southern areas of the ENPs represent two different cases of heterogeneity. In the eastern ENPs the pattern of heterogeneity seems to generate more benefits for the metropolitan region and the country in comparison with the southern ENPs in which population accumulations do not function as critical foundations of their development process.