The practice so far has indicated that there is a sensitive relationship that exists between social and economic subsystem of sustainable development, therefore this research suggests comparison of the states of these two subsystems as a new conceptual frame which is essential for strategic conceptualization of development. The research pointed out a rather visible collision between the achieved degree of economic and social development in the countries of South Eastern Europe in respect to Germany and France, which were taken into consideration as two of the most developed countries in the European Union and in the entire world. The indicators which are given in this research point to the necessity of further scientific and practical consideration of strategic conceptualization of relationship between economics and society.