grad-capm
Capital Asset Pricing Model (CAPM)
Overview
CAPM (Sharpe, 1964; Lintner, 1965) establishes a linear relationship between systematic risk and expected return. The model states that the expected return on any asset equals the risk-free rate plus a premium for bearing market risk, scaled by the asset's beta.
When to Use
- Estimating required rate of return for equity valuation
- Calculating cost of equity in WACC
- Comparing asset risk via beta
- Evaluating portfolio performance against the Security Market Line (SML)
When NOT to Use
- When the asset has significant exposure to size, value, or other factors beyond market risk
- For illiquid or non-traded assets where beta estimation is unreliable
- When market portfolio proxy is questionable (Roll's critique)
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