Intermediate track
IntermediateLesson 19

Alpha vs beta

Alpha vs beta

Beta is the return you get just for riding the market; alpha is the extra from skill.

In short

Beta is the part of your return that comes from market exposure. Alpha is whatever’s left — the bit a manager or strategy adds (or loses) beyond the market’s ride.

If the market rose 10% and you rose 10% with the same risk, that’s all beta — you simply went along for the ride. Beating that, after fair risk, is alpha.

When researchers carefully measured fund managers this way, most showed little or no alpha once fees were counted — the return was mostly beta in disguise.[1]

A sailor and the wind. The wind does most of the moving. Alpha is the extra speed a skilled sailor squeezes out — real, but small and hard to keep up.

Why it matters: beta is cheap and easy to buy. You should only pay high fees for true alpha — and it’s rarer than the brochures suggest.

Where these numbers come from

Finisdom benchmarks any mix against simple market baselines, so you can see whether a fancy strategy actually added anything beyond plain beta.

Check your understanding

You matched the market’s return with the same risk. Your alpha was…

Sources & further reading

  1. 1.Michael C. Jensen (1968) The Performance of Mutual Funds in the Period 1945–1964 — The Journal of FinanceIntroduced “Jensen’s alpha” and found most funds didn’t beat the market after costs.

Related

Tripped up by a word? Look it up in the glossary.

Learning only — not investment advice.