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Investors hear a common refrain year after year: “It’s better to buy and hold and ride out the downturns. Missing only the 30 best days of market returns can meaningfully lower your portfolio value.”Using the S&P 500 Total Return Index since its base date of January 4, 1988, a buy-and-hold investor earned an 11.46% annualized return through July 31, 2026, turning $1 into $65.48.
Missing only the market’s 30 best days over that same span cuts the annualized return to 6.32%, leaving that $1 at just $10.60. That’s a loss of roughly 84% of the wealth a buy-and-hold investor would have built.
That fact is frequently highlighted to support the case for staying invested through downturns. It is also only half the picture.
Run the same exercise on the market’s 30 worst days instead, and a $1 investment that avoided them would have delivered a 17.41% annualized return and grown to $487.56. That’s more than seven times what buy-and-hold produced.
Challenging the conventional narrative
What should an investor make of this information?
It is remarkable that just 30 out of 9,716 market days can create such an extreme impact on wealth creation. While no one can predict the future, thoughtful portfolio construction and the inclusion of risk management strategies can allow an investor to avoid the futility of prediction altogether.
The best and worst days do not scatter randomly across the market’s history. Since 1988, a best or worst day has occurred within 21 trading days of another best or worst day more than 70% of the time.
The single most common gap between them was one day, meaning an extreme day was often followed immediately by another one.
Notably, nearly all of these days showed up during bear markets: On average, the S&P 500 had already fallen 29.17% from its prior peak by the time one of these best or worst days occurred.
Unless investors have tremendous luck or impossible foresight, conventional wisdom suggests that we simply have to take the bad days with the good.
However, the path dependency of returns and the asymmetric nature of drawdowns vs recoveries mean that passively holding through these periods can be far more consequential than the conventional narrative implies.
Consider that a -10% drawdown requires an +11.11% rally to get back to even, a -25% drawdown requires a +33.33% rally, a -40% drawdown requires a +66.67% rally, and a -50% drawdown requires a +100% rally just to break even.
For an investor with a real deadline — retirement in five years, a child’s tuition bill, a home purchase — the amount of time it takes to recover from these drawdowns presents material consequences for their lives.
A downturn that hits at the wrong moment can force a retiree to withdraw a larger share of a smaller portfolio to cover the same living expenses, extending the damage well beyond the market’s own recovery.
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