Various metrics have predicted the majority of slumps for about 100 years. That's like every hour, not "twice". I don't believe the pattern of slumps is random:

Various metrics have predicted the majority of slumps for about 100 years. That's like every hour, not "twice". I don't believe the pattern of slumps is random: it's roughly a decade cycle. Inverting yield curves, PE ratios above average (using long-term earnings), and bull market duration all point to a likely pattern.