beta
A measure of a stock's volatility relative to the overall market. A beta of 1 means the stock moves in line with the market; above 1 means more volatile; below 1 means less volatile.
Example
“With a beta of 1.5, the tech stock tends to rise 15% when the market rises 10% — and fall just as fast.”
Memory Tip
Beta tells you how 'bouncy' a stock is compared to the market.
Why It Matters
Beta helps you understand how much your investment will swing up and down compared to the overall market. If you are risk-averse and prefer steady, predictable returns, you should choose stocks with lower betas. Conversely, if you can tolerate larger ups and downs in pursuit of higher returns, higher beta stocks might suit your investment goals.
Common Misconception
Many people think a high beta stock will always make more money than a low beta stock. In reality, beta only measures volatility, not future returns; a volatile stock can lose value just as easily as it can gain. A high beta stock is riskier but does not guarantee better long-term performance.
In Practice
Consider the overall market moving up 10 percent in a given year. A stock with a beta of 1.5 would typically rise about 15 percent, while a stock with a beta of 0.5 would rise about 5 percent. During a market downturn of 10 percent, that same 1.5 beta stock would fall roughly 15 percent, while the 0.5 beta stock would fall only about 5 percent.
Etymology
From Greek 'beta', the second letter of the alphabet, representing the second component of return in the Capital Asset Pricing Model.
Common Misspellings
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