Fisher states this as an empirical fact, not as an expression of optimism. The historical record of U.S. equity markets, and indeed of most major developed-market indexes, shows an unbroken chain of recoveries from every drawdown in history — including the Great Depression, the 2000-2002 technology collapse, and the 2008-2009 financial crisis. This is not a guarantee of future behavior, but it is a base rate that deserves more weight in investor decision-making than it typically receives.

The behavioral problem Fisher diagnoses is that investors experience each bear market as a live question rather than as a pattern with historical precedent. During a deep drawdown, the emotional experience is one of genuine uncertainty about whether the market will ever recover. That uncertainty feels reasonable because the future is genuinely unknown. But Fisher argues that the prior probability of recovery, given the full historical record, is so high that selling in panic is almost always a mistake.

The asymmetry matters: selling during a bear market locks in a loss and creates a second decision problem — when to re-enter — that investors consistently get wrong. Studies of investor cash-flow timing show that retail investors systematically sell near market bottoms and buy near peaks, destroying the long-term returns of the very funds they hold.

Fisher's book is partly a corrective to this pattern. By cataloging the historical recovery timeline for past bear markets, he gives investors a data-grounded reason to hold rather than flee when the emotional impulse to exit is strongest.