Secular Stagnation or Kondratiev phase B?

The recent debates around the topic of secular stagnation invite us, in this article, to get back to the long waves associated with the name of N.D. Kondratiev, which have kept on arousing many researchers' interest, in particular since the 2008 slump. The topical relevance of Kondratiev is nonetheless marked by significant differences between authors that concern both the identification of the long current wave and the nature of the phase which characterizes the contemporary period. The long-lasting period of sluggishness and difficulties of capitalist economies (phase B), which commenced at the beginning of the 1970s, suggests the establishment of a link between its scope and the hypothesis of secular stagnation. Given the trends that have been implemented over the last decades, the question of the disappearance of the Kondratiev as a long wave of growth deserves to be raised.