The paper consists of three parts. The first part discusses the socialist thought and practice, the second the theory of crisis in the economy with centralized planning, and at the end the author analyses the role of dollar black market in the planned economy in Poland. The first part has the following structure: Four methodological fields of research Socio-experimental cycles; Consumed legitimacy; Anorganic dictatorship versus the organic dictatorship; MPC triangle (market - plan - compromise) as the 20th century heritage. The second part investigates the conditions for the balance in planned economy, functional and non-functional processes in planned economy and finally the failure of planned economy. The third part discusses the issue of the relation between the black market course of dollar and the balance levels of domestic (in this case - Polish) planned prices.