Indexy a trhy
Correction vs. Crash: The Difference That Will Calm Your Nerves
Key takeaways
- A correction is a decline of 10–20% from the peak; a crash or bear market occurs at a decline above 20%.
- Corrections occur on average once a year and are a normal part of the market cycle.
- In real time it is impossible to know for certain whether it is a correction or the start of a crash.
- A long-term investor does not need to distinguish between a correction and a crash — the strategy is the same.
- A cash reserve outside the investment portfolio is insurance that allows one to ride out even a deep drawdown.
A correction is a stock market decline of 10–20% from the peak; a crash or bear market occurs when the drop exceeds 20% — but both situations bring the same emotional burden.
How frequent are corrections
Corrections are a common and healthy part of the market cycle. Historically, corrections in the range of 10–20% in the S&P 500 occur on average once every 1–2 years. They are natural "exhales" — markets overheat, a valuation correction brings prices back in line with fundamentals and the cycle continues.
That is why experienced investors do not share corrections as a catastrophe but as an opportunity to buy more — in line with the principle of cost averaging.
Crash — a different league
A crash (or bear market) is a deeper and longer affair. Examples from the S&P 500:
- Dot-com (2000–2002): decline of approximately 49%.
- Financial crisis (2007–2009): decline of approximately 57%.
- COVID crash (2020): rapid decline of approximately 34%, but only 5 weeks at the bottom.
Why you cannot tell the difference in real time
At the moment the market is falling, no one knows whether it is a correction or the beginning of a crash. Even the biggest crashes started as what looked like corrections. The only safe strategy is therefore one that works in both scenarios.
Strategy for both cases
Keep a cash reserve outside your equity portfolio — not for timing, but as a psychological buffer and source of liquidity. Invest regularly regardless of current market movements. How historical returns have looked after such drawdowns is explained in the article on historical equity market returns. What risk is and how to measure it is covered in the article on risk.
FAQ
What is the difference between a correction and a crash?
A correction is a decline of 10–20% from the peak; a crash or bear market occurs at a decline above 20%. Corrections are frequent and short; crashes are deeper and longer.
How do you know it is a correction and not a crash?
You cannot know for certain in real time. Even the largest historical crashes began as what appeared to be corrections. That is why a strategy that works in both cases — and a sufficient time horizon — is essential.
How do you prepare for a market decline?
Keep a cash reserve outside investments for psychological calm and living expenses. Invest regularly via DCA. Set up your portfolio so a deep drawdown does not threaten your life plans.