About the Dependence of the Currency Exchange Rate at Time and National   Dividend, Investments Size, Difference Between Total Demand and Supply
  The time dependence of the currency exchange rate K treated as a function of national dividend, investments and difference between total demand for a goods and supply is considered. To do this a proposed earlier general algorithm of economic processes describing on the basis of the equations for K like the equations of statistical physics of open systems is used. A number of differential equations (including nonlinear ones too) determining the time dependence of the exchange rate (including oscillations) is obtained. 
L.Ya. Kobelev, O.L. Kobeleva, Ya.L. Kobelev