There is debate in regard to the capital asset pricing model about the appropriate Rf,Km,and stability of beta.

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The capital asset pricing model (CAPM) has long been subject to debate surrounding the appropriateness of certain assumptions, such as the choice of the risk-free rate (Rf), the equity market premium (Km), and the stability of beta. Some argue that these inputs can vary significantly over time and across different market conditions, which can affect the accuracy and usefulness of the CAPM as a tool for evaluating investment opportunities.

There Is Debate in Regard to the Capital Asset Pricing