Lesson 5 of 7
Risk is not volatility
A price that moves and money lost for good are not the same thing. The market's own worst calendar years show why.
By Javier Sanz
Founder of ValueScreener. Built Ninety Nine, a securities services provider, and sold it to a tier-one global bank; ran operations and internationalization at Alpaca, the brokerage API.
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In one minute
- Volatility is a price moving. Risk, in the sense that matters, is money lost for good.
- The stock market's worst calendar years were sharp, and in dollars the index recovered from every one.
- A price falling is not the same fact as a business becoming worth less than it was.
A price can fall a great deal in a single year and still recover in full. Two things do not come back: value the business itself has lost, and a loss locked in by selling at the bottom.
The S&P 500's six worst calendar years, 1967 to 2025
- 2008−37.0%
- 1974−26.4%
- 2002−22.1%
- 2022−18.1%
- 1973−14.8%
- 2001−11.9%
What "risk" means here
Marks, in The Most Important Thing, argues that risk is not the same thing as volatility: a price bouncing around is not, by itself, money gone.
Volatility
- How far the price moves.
- Visible every day, in the quote.
- Reverses if the business holds up.
Risk
- The chance of losing money for good.
- Comes from the business weakening, or from paying too much for it.
- Not visible in the quote.
Risk is the chance of a permanent loss of capital, not how choppy the quote has been.
When a fall becomes a loss
Klarman argues in Margin of Safety that risk depends on the price paid, not on how much the quote moves. A fall in the price is not, by itself, a fall in value. In every one of the six years above, the S&P 500 itself went on to set new highs. Whether a given fall in price became a permanent loss depended on what happened after it, a change in the business, or a sale made at the bottom, not on the size of the fall alone.
Each of these six years has its own history, a financial crisis, an oil shock, a recession, and each is a different story. The pattern across all six is the same one: a sharp fall, and then, eventually, a full recovery in the index itself.
When the difference stops mattering
None of this erases the practical side of a sharp fall. Money needed within a year or two can be forced out at the bottom by a bill or a margin call, at which point a paper decline becomes a realized one. The distinction between risk and volatility describes what a fall means for someone who is not forced to sell, not a promise that no one ever is. Two holders of the same index can live the same six years differently. For one it was a dip; for the one forced to sell at the bottom, a permanent loss.
Check yourself
What does it mean to say risk is not volatility?
- A price that moves is automatically a loss
- Volatility is a price moving; risk is the chance of a permanent loss of capital
- Volatility and risk are two names for the same thing
Show the answer
Answer: B.
Marks separates the two: a bouncing price is not by itself a loss. A permanent loss comes from the business losing value or from overpaying.A holding falls from $100 to $60 and later recovers to $100. Has an investor who held throughout lost money?
- Yes, permanently
- No, the price came back before they sold
- Only half of it
Show the answer
Answer: B.
The fall reversed, so it was volatility. Had the business lost value for good, holding on would not have saved the money.Which of these is a permanent loss of capital?
- The index fell 37 percent in 2008, then set new highs
- A company failed and its shares were cancelled
- A price swung 20 percent in a year and ended flat
Show the answer
Answer: B.
A cancelled share never comes back. The 2008 fall reversed, and a price that swings and ends flat has lost nothing.Sources
- Marks, The Most Important Thing, 2011, on risk as the probability of permanent loss rather than the volatility of a price.
- Klarman, Margin of Safety, 1991, on risk as a function of the price paid rather than the volatility of the quote.
- Berkshire Hathaway shareholder letter, 1987, on volatility hurting an investor only when pressure forces a sale at a bad time.
- Berkshire Hathaway 2025 annual report, table "Berkshire's Performance vs. the S&P 500", on the S&P 500 with dividends by calendar year, 1965 to 2025.
What this leaves out
- The chart shows the index's own worst calendar years, not any individual company's, and not any year still to come.
- 1965 and 1966 run to 30 September, so the chart starts in 1967. Recovered means in dollars with dividends reinvested, before inflation.
- The two-holding example is illustrative. A real decline of 50 percent does not always recover.
- Nothing here is advice about any security, and it is not a forecast that a future fall will be temporary.