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Understanding Volatility and Standard Deviation in Investing

Beginner Investing • 5 min

What this lesson is about

Volatility isn't automatically bad. It just means bigger swings in both directions, not only down.

2 parts · a quick check after each · then the quiz

Part 1 of 2

Volatility isn’t automatically bad. It just means bigger price swings in both directions. Standard deviation measures it. It shows how much an asset's returns stray from their average. A stock with a higher standard deviation moves more than one with a lower standard deviation. That’s all there is to it.

Higher volatility means more potential upside. It also means more potential downside. It’s not just about more risk of loss.

Spread around an averageTwo groups with the same average can be nothing alike. Move the spread.

Quick check

What does 'volatility' measure in investing?

Part 2 of 2

Insider Angle: Professionals rarely label volatility as good or bad. They focus on whether an investor's time horizon and temperament can handle it. What panics a short-term trader is often just noise for someone investing for 20 years.
Try This: Compare two stocks you know. One should be 'steady,' the other 'wild.' Check their actual price charts from the past year. Was your instinct about which one is more volatile right?

Quick check

What is standard deviation used for in finance?

Quiz

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