CAPM links risk and return: it says an investor should be compensated for the time value of money (the risk-free rate) plus the risk taken (beta times the market risk premium). It underpins the cost of equity used in valuation.
Formula
Expected Return = Risk-Free Rate + Beta × (Market Return − Risk-Free Rate)
Example
With a 6% risk-free rate, a beta of 1.2 and a 10% expected market return: Expected return = 6% + 1.2×(10%−6%) = 10.8%.
Relevant NISM series
See Capital Asset Pricing Model (CAPM) in exam questions
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