Cognitive Scaffold

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MENTAL MODEL · M0424

Alpha and Beta

Alpha and Beta
BusinessHigh supportFinance
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

Beta (β) refers to the average return obtained by following market fluctuations (market return); Alpha (α) refers to the excess return beyond the market (skill return).

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

Distinguish luck from skill. When evaluating fund managers or personal achievements, strip away the "rising tide lifts all boats" beta component to see whether they truly created unique alpha value or merely rode the wave.

anchor

Anchor fast decisions

Beta (β) measures the systematic sensitivity of an asset to the market, while Alpha (α) refers to the excess return above the market benchmark, representing stock selection/timing ability.

MINIMUM ACTION

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Alpha_and_beta_maleZH · Explicit
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