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Beta (or the "beta coefficient") is a way to measure the relative risk (as measured by volatility) of a share or tracker fund. It does so by comparing the historic movement in the share price to that of the market as a whole.
So, for example, if a share typically moves up by 10% when the market has risen by 50%, beta is 10/50 = 0.2. Equally, a share that increased by 100% when the market rose 50% has a beta of 100/50 = 2. Therefore, a stock that swings more than the market over time has a beta above 1.0, while a stock that is less volatile than the market will have a beta below 1.0.
Shares with a high beta are generally more volatile and therefore seen as higher risk than those with a low beta such as utility companies.
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See Tim Bennett's video tutorial: What is 'beta'?
Get the latest financial news, insights and expert analysis from our award-winning MoneyWeek team, to help you understand what really matters when it comes to your finances.
MoneyWeek is written by a team of experienced and award-winning journalists, plus expert columnists. As well as daily digital news and features, MoneyWeek also publishes a weekly magazine, covering investing and personal finance. From share tips, pensions, gold to practical investment tips - we provide a round-up to help you make money and keep it.
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