It's the Juglar cycles. It has been known since the 1860s, and Karl Marx talk about this extensively in Das Capital, volume 3. As production increase, it enter a phase of speculation, overproduction, market saturation, which leads to a crash. Once the factories have gone bankrupt, the overproduction cease, and a new cycle begins. Of course, the mainstream society gives false narratives to explain this phenomenon. For example, the 2001 crash was attributed to the "dot com bubble". The 2008 crash attributed to the subprimes, and the 2020 crash, to the plandemic. But it's always the end of a Juglar cycle. The official narrative only serve as a diversion from the truth.