The modern market economic system is based on dual relations between managing subjects, namely, the small and medium business, on the one side, and the large business, on the other side. While the former one gives mobility and flexibility to the economic system, the latter one attaches it competitiveness and stability. During economical transformation of the post-socialist countries, independent small and medium enterprises have appeared. Large Russian corporations (holdings, financial-industrial groups, etc.) began to arise from privatization of large national enterprises and by association of several smaller managing structures. This causes the necessity to study the economic relations between the small, medium, and large business in Russia.