In 1926, Nikolai Kondratiev pinpointed waves that seemed to last around 50 years and include alternating phases of expansion and depression. Within this broader “Kondratiev wave”, two key harmonic variations were identified by other economists: the Juglar cycle and the Kitchin cycle. Ironically, while such classical economic cycles have faded from mainstream discourse, the same patterns continue to manifest themselves, says Didier. In this report, he draws some direct investment conclusions.