For the last three decades, space has become a significant dimension in social science analysis. In many developed countries, economic growth is slowing down, and in some cases restrained, due to environmental considerations, and the real question is the optimum spread of development over space rather than the growth over time. In the developing countries, limited and uneven distribution of population and resources, and the existence of heterogenous groups, highlighted the need of balanced regional development. The energy cl sis and the realization that energy resources are very limited and...