Capital asset pricing model (CAPM)

The capital asset pricing model has been widely used for many years by the global financial services industry to try and predict the returns you should expect from a stock.

If a stock offers a return above that predicted by CAPM you should buy it, and vice versa. The starting point for a stock’s expected return is the minimum ‘risk free’ return an investor should expect from medium-dated AAA government bonds, say 5%. You then add a premium, because stocks in general are riskier than bonds.

This figure is heavily debated, but let’s say it is 3%. Now you adjust that extra premium for a stock’s specific beta, say 1.2. So the expected CAPM return here would be 8.6% (5% + (3% x 1.2)). If you expect the stock you are reviewing to deliver, say, a 10% annual return, then it’s a buy, says CAPM.

• See Tim Bennett’s video tutorial: Warning: the City’s formula for pricing shares is bust.

66% off newsstand price

12 issues (and much more) for just £12

That’s right. We’ll give you 12 issues of MoneyWeek magazine, complete access to our exclusive web articles, our latest wealth building reports and videos as well as our subscriber-only email… for just £12.

That’s just £1 per week for Britain’s best-selling financial magazine.

Click here to take advantage of our offer

Britain is leaving the European Union. Donald Trump is reducing America’s role in global markets. Both will have profound consequences for you as an investor.

MoneyWeek analyses the critical issues facing British investors on a weekly basis. And, unlike other publications, we provide you with the solutions to help you turn a situation to your financial advantage.

Take up our offer today, and we’ll send you three of our most important investment reports:

All three of these reports are yours when you take up our 12 issues for £12 offer today.

MoneyWeek has been advising private British investors on what to do with their money since 2000. Our calls over that period have enabled our readers to both make and save a great deal of money – hence our position as the UK’s most-trusted investment publication.

Click here to subscribe for just £12