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The first half of the sixties of the twntieth century implied a certain landmark in the Czechoslovak history when the dynamic economic development in the fifties was changed for the economic stagnation. The lowest annual increases of national product during the central planning in Czechoslovakia were created just in this period. The lowest growth of the national product was reached in 1963 when the national product decreased in absolute value of 2.1 % in comparable prices. This negative value was unusual even among other countries of the socialistic block. This diploma thesis deals with causes of this stagnation of the Czechoslovak economy in the first half of the sixties of the twentieth century. It consists of five chapters; each is devoted to a certain possible cause of this stagnation. The first chapter outlines the economic development of Czechoslovakia since the end of wordl-war II till the end of the fifties. The second chapter concerns with the structure of Czechoslovak economy and its reform by the end of the fifties. The fourth chapter is related to the development of external economic relations of Czechoslovakia reflecting the performance of foreign trade. The last chapter deals with the state of the Czechoslovak economy in the first half of the sixties.