In the past 100 years, we've experienced just a handful of truly awful markets; the Great Depression, the post‐go‐go years meltdown, the 1973–1974 bear, the dot‐com bubble bursting, and most recently, the great financial crisis. Selling every time stocks fall a little is no way to invest because you'd live in a constant state of regret, and regret is one of the most destructive emotions in the cognitive‐bias tool kit.
