March 9, 2009. The S&P 500 bottomed that day at 676, down about 57% from its October 2007 peak. If you’d put $100,000 in an S&P 500 index fund at the 2007 peak, your statement read roughly $43,000 at the bottom. Every headline that week was some version of the end of investing.
Then: the same index made a full round trip back to its old high by March 2013, about four years after the bottom. And the $100,000 you didn’t sell? It kept compounding from there. That single sequence — fall, hold, recover, compound — is the entire crash experience, and most people never see it laid out year by year. So here it is.
The Two Crashes Everyone Actually Remembers
2008–2009 (global financial crisis): roughly a 57% peak-to-trough decline over about 17 months, followed by a recovery to the prior peak that took about four years from the bottom (roughly 5.5 years peak-to-peak on price alone). Dividends shortened the recovery.
2020 (COVID): roughly a 34% decline in about five weeks — one of the fastest bear markets ever — followed by a full recovery to the prior peak in about six months. Fastest round trip on record for the modern index.
Two crashes, two completely different clocks. That variance is the honest headline: you cannot know in advance whether the next crash is a six-month event or a five-year one. You can only know that historically, every major US drawdown has eventually recovered — and that “eventually” is the price of admission.
Year by Year: What Happens to $100,000 If You Do Nothing
Here’s an illustrative sequence built on a stylized crash — a −40% year followed by partial recoveries, with $12,000 added at the end of each year. This is a hypothetical for teaching the mechanics, not a prediction:
| Year | Event | Start balance | End balance (after that year’s $12,000 deposit) |
|---|---|---|---|
| 0 | Market up 10% | $100,000 | $122,000 |
| 1 | Crash: −40% | $122,000 | $85,200 |
| 2 | Rebound: +25% | $85,200 | $118,500 |
| 3 | Rebound: +20% | $118,500 | $154,200 |
Now the row that matters. Run the same four years with a smooth +10% every year instead of the crash, and the balances go $122,000 → $146,200 → $172,800 → $202,100. So three years after a 40% crash, the crash-path investor still has less money on the statement — $154,200 vs $202,100. But look underneath the prices: the crash-path investor bought shares at 60, then 66, then 82.5 on a scale where the smooth-path investor paid 110, 121, 133. Count the shares and the crash path owns about 13% more shares for the same total deposited. If both investors later face the same future prices, the person who kept buying through the crash is, from that point on, permanently ahead by roughly that margin.
The caveats, honestly stated: real crashes don’t come as one clean −40% year; rebounds don’t arrive on schedule; and this table assumes you didn’t sell. It also assumes a recovery actually comes, which history supports for diversified indexes over long horizons but no one can guarantee for any specific window you happen to be living through.
Why Selling Turns a Paper Loss Into a Real One
While you hold, a drawdown is a number on a screen. The moment you sell, three things lock in:
- The loss becomes permanent. Recovery requires being in the market. The rebound years — historically some of the strongest days cluster near the bottom — do their compounding without you.
- You create a tax bill (in a taxable account), possibly at short-term rates.
- You face the re-entry problem. Getting back in after selling requires calling the bottom twice — once when selling, once when buying back. Almost nobody can do it, and the data on missed best days is brutal: a large share of the market’s strongest single days occur within two weeks of its worst days, during exactly the panic window when you’d be out.
This is why the behavior side of investing matters more than the selection side. I wrote my honest take on dollar-cost averaging as a behavior tool rather than a math edge, and it applies double in a crash: the person with automatic monthly contributions is buying the dip whether they feel brave or not. The person investing manually is making a courage decision at the worst possible time.
Sequence Risk: When Crashes Actually Hurt
A crash in year 3 of a 20-year accumulation plan is a gift — cheaper shares for a high earner still contributing. The same crash in the year you retire, when you’re withdrawing 4% a year, is a different animal: you’re selling shares at depressed prices to live, and the recovery has to be much larger to make up the withdrawn dollars. That’s sequence-of-returns risk, and it’s the reason retirement portfolios are designed differently from accumulation portfolios — more bonds near the finish line, cash buffers, spending flexibility.
I ran this exact scenario in a 40% crash in year 3 vs year 19 — same crash, wildly different cost depending on when it lands. The takeaway isn’t “avoid crashes.” You can’t. It’s “make sure a crash at the wrong time can’t force you to sell,” which for accumulators mostly means: keep your emergency fund out of the market and your timeline long.
What Actually Protects You (Ranked)
- Cash reserves outside the market. The single most protective thing you can own in a crash is money that isn’t in a crash. If your emergency fund can carry you 6–12 months, no margin call of life can force a sale.
- An allocation you chose knowingly. If a 40% drawdown would genuinely wreck you, the fix isn’t courage — it’s holding more bonds, deliberately, in advance.
- Automation. Contributions that leave your account without a decision attached keep buying through the bottom, which is where the best future returns historically get purchased.
- A written plan. One sentence: “In a drawdown of X%, I will do nothing except continue scheduled contributions.” Written during calm, read during panic.
What doesn’t protect you, in my experience of watching people (including me) get through these: predicting the crash, exiting in time, getting back in later, or holding “defensive” stocks as a substitute for cash. Timing has to be right twice; protection only has to be set up once.
The Honest Caveats
Historical recovery is not a law of physics. Japan’s market spent decades below its 1989 peak. The US has recovered from every major drawdown so far, and betting on US companies has been a winning bet for a century, but a diversified investor should still know that “it always comes back” is an observation from one country’s history, not a guarantee. That’s a genuine argument for international diversification, and also for never letting your timeline depend on a single market’s recovery speed.
Not financial advice, as always — this is history and arithmetic, laid out so you can decide your own tolerance in advance.
One forward step: before the next crash (there’s always a next one), write down your number — the drawdown size at which you’d want to change something — and what “change” would mean. Then, if you want the long view, skim the major drawdowns and recoveries I laid out in the market history primer. Crashes feel random in the moment; seen on a century-long chart, they’re a feature of the terrain, not a bug in your plan.
