The 28-Year Cycle in the U.S. Stock Market.
This dominant time cycle was the driving force behind the last two secular "lost decades" in equities:
The stagflationary 1970s
The Dot-Com / GFC crash of the early 2000s
As mapped below, the S&P 500 is fast approaching the cliff of another major down-phase.
Time is running out for this macro expansion.
Note: this cycle is not for market timing, but for long-term picture.