Four theoretical studies on demo-economic relations in an open world.

Summary Our work deals with demo-economic relations in an open world. We examine successively several aspects: the preferability of alternative movements of capital and migration, the influence of the choice of pension system in one country on that of another, the influence of the demographic factor on unemployment in the context of so-called "competitive" economies, as well as the possible use of immigration in a post-Keynesian analysis in France in the year 2000, and finally, the possible negative effects of population in the context of transborder pollution. The conclusion tries to formally update the concept of open demo-economic relationship (OEDR).