Investing term

What is Volatility?

How much an investment's price swings, up and down, over time.

Volatility measures how much and how quickly an investment's price swings up and down. A savings account has near-zero volatility; a single small tech stock can swing 10% in a day. It's the most common everyday stand-in for "risk" — higher volatility means a bumpier ride and a wider range of outcomes, not necessarily worse returns.

The key insight is that volatility hurts most when it forces you to act. If you don't need the money for decades, short-term swings are just noise you can ride out; if you need it next year, that same volatility is a real danger because you might be forced to sell while prices are down.

For example

Two funds can both average 7% a year, but if one bounces between −20% and +30% while the other stays near +7%, the first is far more volatile — same destination, much rougher road.

Volatility is taught hands-on in Stage 2 — Why Investing Matters (And When It Doesn't).

See the lesson →

Related terms

Asset classA broad category of investment with similar behavior. Stocks, bonds, cash, real estate, commodities.Behavior gapThe difference between a fund's reported return and what its investors actually earned — usually worse.Dollar-cost averagingInvesting a fixed amount on a fixed schedule, regardless of market level.FOMO buyingFear of missing out — piling into something after it has already run, because everyone else seems to be winning.
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