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Explain why when using the CAPM, systematic risk is more important that total risk. Give at...

  1. Explain why when using the CAPM, systematic risk is more important that total risk. Give at least three reasons why.
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Answer #1

The CAPM or Capital Asset pricing model assumes the cost of equity as

Ke = Risk free rate + Beta * Market risk premium

where Beta is the measure of systematic risk and not the total risk. There are few reasons why systematic risk is used instead of total risk.

a) The model assumes that investors can manage the firm risk or idiosyncratic risk through diversification and hence the only risk prevalent in the model is systematic or market risk.

b) While firm risk can be completely mitigated, the systematic risk is completely unpredictable and cannot be completely mitigated.

c) The Beta is calculated by regressing the security returns against the market returns and the slope of the line is the measure of Beta or systematic risk. The slope of SML is taken as Beta. The equity risk premium for the security is thus is a function of Beta and Market risk premium

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