EN
The article presents an attempt at methodological interpre tation of certain assumptions trom the well-known work of J. Schumpeter — Business Cycles. There is analyzed the „pure model" and modification of its assumptions based on a general theory of economic equilibrium elaborated by J. Warlas. Next, the author presents foundations lor the historical and statistical verification of the concept of three paralk'Ily developing cycles (Kitchin's, Ju g iar's and Kondratiev's). It is underlined in the final remarks th a t J. Schumpeter's vision of economic evolution is of a descriptive character as the theory created by him cannot fully explain this vision.