Why “Once in a Century” Shocks Keep Happening
Each specific catastrophe may have a very low annual probability, but the world contains many distinct catastrophic possibilities. Aggregating those possibilities makes the chance that at least one major shock occurs far higher than people intuitively expect.
- A single named disaster can remain genuinely unlikely.
- Many independent low-probability risks create a meaningful aggregate probability.
- Several supposedly once-in-a-century events can occur within one investing career.
- Risk planning should consider the category of surprise, not only named scenarios.
“the odds at any one of those will occur are very low, but the odds at least one of them will occur are pretty good.”
“In twenty years, you've had like five once in a century events, and I think that'll be the case going forward as well.”