A single number tells an investor whether a stock swings harder than the market or barely moves at all. That number is called beta, and it’s one of finance’s most-used shortcuts for risk.
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What Is Beta?
One number, one measure of market risk
Beta = 1Moves with the market
Beta > 1More volatile than the market
Beta < 1Less volatile than the market
Negative BetaMoves opposite the market
Q73 answer: (d) A numeric value measuring a stock’s fluctuations relative to the overall market.
🏛️ Must Know
What Beta Measures
- Definition In finance, ‘beta’ refers to a numeric value that measures the fluctuations of a stock relative to changes in the overall stock market.
- Beta = 1 A stock with beta of 1.0 moves in line with the market — if the market rises 10%, the stock tends to rise about 10% too.
- Beta > 1 A stock with beta above 1.0 is more volatile than the market. A tech stock with beta 1.75 would tend to move 175% as much as the market.
- Beta < 1 A stock with beta below 1.0 is less volatile than the market — a utility stock with beta 0.45 would tend to move only 45% as much as the market.
🏘️ Good to Know
Where Beta Is Used
- Systematic Risk Beta is a measure of systematic risk — the market-wide risk that can’t be eliminated through diversification, unlike company-specific risk.
- CAPM Beta is a core input to the Capital Asset Pricing Model (CAPM), which estimates a stock’s expected return based on its risk relative to the market.
- Negative Beta A negative beta means a stock tends to move opposite to the market — for example, some gold-mining stocks can rise when broader markets fall.
- Not to Be Confused With Beta is distinct from arbitrage (simultaneous buying/selling across platforms), hedging strategy, or basis risk — all of which describe different financial concepts entirely.
Test Yourself
📝 Previous Year Question
UPSC CSP 2023 — The Term ‘Beta’ in Finance
- UPSC 2023 In finance, ‘beta’ refers to a numeric value that measures the fluctuations of a stock relative to changes in the overall stock market. See UPSC CSP 2023 GS Paper I, Q73.
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