In the popular imagination, market crashes are once-a-generation catastrophes — 1929, 1987, 2008. The framing is comforting because it suggests crashes are anomalies. They aren’t. The historical record of U.S. equity markets shows substantial drawdowns roughly every five to ten years, and double-digit pullbacks several times a decade. Investors who treat crashes as black swans are mismodeling the asset class they own.
The right mental model isn’t “what if a crash happens?” It’s “what’s my plan when the next one does?”
The data says crashes are routine
Going back to 1928, the S&P 500 has experienced a 10% correction roughly once every 18 months on average. A 20% bear market has occurred about every 5 to 6 years. A drawdown of 30% or more has happened about once a decade. That includes 1929, 1937, 1973–74, 1987, 2000–02, 2008–09, March 2020, and 2022. None of these were predictable in advance. Together, they make a clear pattern: the long-run return on stocks comes with a baseline frequency of severe pain. The decade-plus stretch from 2009 through 2019 with no major drawdown was historically unusual, not the new normal.
Recency bias warps how investors plan
Most retail investors today started investing after 2009. Their entire experience, until 2022, was a market that recovered quickly from every dip. That bias has consequences: under-diversification, over-allocation to growth stocks, and emergency funds that exist only on paper. When the next deep crash arrives, the investors who haven’t lived through one are the ones most likely to sell at the bottom — and selling at the bottom is the only behavior that turns a temporary drawdown into a permanent loss. The mechanism that makes stocks pay above-bond returns is the willingness to sit through these periods. Most people overestimate that willingness when they’re not in one.
The “long run” doesn’t help if your timeline is short
The reassurance that “stocks always recover” is true on long horizons — but the recovery time has, in past crashes, run from 18 months to over 15 years in real terms. The Dow took until 1954 to surpass its 1929 peak in nominal terms. The Nasdaq took 15 years to reclaim its 2000 high. If your investment horizon is your retirement five years out, “stocks recover eventually” is not actionable advice. The asset allocation rule of thumb that bond exposure should rise as you age exists precisely because crash timing matters more when the recovery window is short.
Plan for the next one before it arrives
Have an emergency fund that doesn’t depend on stock balances. Hold an asset mix you’d be willing to maintain through a 40% drop. Decide rebalancing rules in advance — written down, ideally — so you don’t make portfolio decisions in the middle of panic. Avoid leverage in equities you can’t afford to ride out.
The bottom line
Crashes aren’t rare. They’re a feature. Plan as if the next one is in the next decade — because, statistically, it probably is.
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