Over the last thirty years international migration, defined as voluntary plus involuntary movement of people across borders, has increased enormously. Approximately half of all international migration has taken place within the developing countries and the annual growth rate has been steeper compared to the one of developed countries. Surprisingly, the vast parts of the literature on international migration concentrate on the North-South migration, without considering the South-South one. The scope of this paper is threefold: to analyze the phenomenon of international migration within developing countries, to provide a theoretical framework to study its effect on the receiving country’s economic development and to assess some of its securit...