DOI: https://doi.org/10.33917/es-4.178.2021.22-35

The article discusses a promising and well-proven tool for analyzing economic relations in socio-economic systems, which is actively used all over the world — the matrix of financial flows. The paper identifies the main areas of its application and briefly describes the history of its development in the world and specifically for Russia. The author also features the process of constructing a matrix for 12 economic regions of our country by types of economic activity. In the course of filling with statistical data the problem of assessing the volume of interregional trade was identified, which made it necessary to undertake an additional research, the results of which are presented in the article. In conclusion an example of practical use of the constructed matrix as an independent tool, as well as part of a more complex economic and mathematical model, is demonstrated