Investor Corner/The asset classes/Equity Concepts
2.1.4 Volatility
Volatility measures how much and how fast prices move, in both directions. It is often used as shorthand for risk, but it is not the same thing as a permanent loss of capital.
Movement, not necessarily danger
A highly volatile stock or fund can swing sharply up as well as down. What volatility actually measures is the size and frequency of price changes over a period, not the direction of those changes. A fund that doubled and then fell by a third along the way is highly volatile, even though an investor who held through the whole period still ended up well ahead.
Why it feels like risk
Volatility feels like risk because large swings are uncomfortable to watch, and discomfort is what drives investors to sell at exactly the wrong time. The real danger is rarely the volatility itself. It is the decision to sell during a volatile drop, converting a temporary paper loss into a permanent, realised one.
Living with it
Volatility cannot be removed from growth assets without also removing most of their expected return. The practical approach is to hold only as much of a volatile asset as matches a genuinely long time horizon, so that short-term swings have time to resolve before the money is actually needed.
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