The main aim is to investigate the interaction of the three sectors of the national economy of Russia: industries, producing capital goods and production services to the organizations (sector A), industries, producing consumer goods and services to the people (sector B) and industries, producing financial services (banking, insurance, investment and other) to the organizations and people (sector C). To achieve this, the author has applied transaction - sectoral research methodology used in the national economy and statistics of national accounts, as well as the calculations of gross output and gross domestic product of Russia for the period from 1961 to 2011. As a result of statistical analysis was developed formalized mathematical model of the interaction of the financial sector to the real sector of the national economy of Russia.

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