The paper explores the relationship between inflation and the nominal interest rate, GDP and total income of the population. Based on the mathematical modeling methods, dynamics of the determination coefficient of time series of these indicators was considered. The study is based on the data obtained from Russian open sources in 2002-2016. The main results are: 1) The type of function of the interrelation between the interest rate and inflation was revealed; 2) The behavior of the obtained function in time cycles was determined; 3) The periods and cycles of the interest rate influence as a tool of financial and monetary policy were determined. The proposed approach can be used for a more in-depth study of the interrelationships of macroeconomic indicators, as well as building more accurate models for their describing.
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