"The market can remain irrational longer than you can remain insolvent."
--John Maynard Keynes
Lots of people lost their shirts shorting the housing market prior to the 2008 crash. (_The Big Short_ highlights those who were successful, but plenty of people weren't.) But it was undoubtedly a bubble and there was a world-wide recession when it popped.
If someone claims to be certain of the future with much more clarity than the rest of us, yet is unable to find ANY way to turn that advantage into leverage, I certainly would not trust the person on that issue.
Lots of people lost their shirts shorting the housing market prior to the 2008 crash. (_The Big Short_ highlights those who were successful, but plenty of people weren't.) But it was undoubtedly a bubble and there was a world-wide recession when it popped.