How can the CAPM be used to estimate the cost of capital for evaluating real investment decisions by a firm?

Answer:
C.A.P.M describes the relationship between beta, market risk and expected return of the investment. In order to use the CAPM to estimate the cost of capital for this investment decision, we need to historical data, extract their levered beta, determine the appropriate manner to average them, and apply the resulting risk to the investment's CAPM.
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