EN
The study examines the development of the Polish economy as well as the economies of selected European Union countries in the period from 1949 to 2006. Much space is devoted to a comparative analysis of the development economies in the countries concerned. Based on statistical data appropriate synthetic variables were set. Much space is devoted to the theory of the Johansen's method, to present the dependencies occurring in the dynamics of economic development in subsequent subperiods. The method allows for a comparative assessment of the dynamics of time series. The methods are adopted to examine the level of economic development, to determine the period of long-term equilibrium and stability.