Aside from the reality of periodic crises that break out on the basis of industrial cycles, the changes in the pace of capitalist development over long periods have continuously preoccupied Marxists as well. There have been many debates concerning the fluctuations in the curve of capitalist development that have been identified to occur over the course of decades. In these debates there have been certain conceptions developed in an effort to deepen the understanding of the workings of capitalism, without drifting away from basic tenets of Marxism. But there have also been other interpretations that are at variance with foundations of Marxism, leading to various misconceptions. The analysis of “long waves” that will be discussed below belongs to the latter category. Let us underline an important point to prevent any misunderstanding regarding the target of criticism. To be able to comprehend concrete fluctuations in the curve of capitalist development, it is of importance to analyse long periods with different characteristics. There is nothing to criticise about it. What deserves criticism, however, is the type of “long waves” theory which, in effect, is used in place of periodic long cycles, as seen in the case of Kondratiev.