Question

Assume that the assumptions of the CAPM hold. The expected return and the standard deviation of...

Assume that the assumptions of the CAPM hold. The expected return and the standard deviation of the market portfolio are 7% and 14%, respectively. There are two individual stocks A and B:

Mean Return A: 4% Standard Deviation A: 18%

Mean Return B: 12% Standard Deviation B: 36%

Stock A has a correlation of 0.2 with the market portfolio.

A.What is the beta of stock A?

B.What is the risk free rate?

C.What is the beta of a portfolio with 40% in stock A and 60% in stock B?

D.What is the idiosyncratic volatility of the portfolio from part C?

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Answer #1

A.

Beta = Covariance(Stock returns, market portfolio returns)/Variance(Stock Returns)

Covariance(Stock returns, market portfolio returns) = Correlation(Stock returns, market portfolio returns)*Standard Deviation of Stock Returns*Standard Deviation of Market Portfolio

B7 : X fi =B6/B4 A 1 B Stock A 4% 18% 3.24% C Stock B 12% 36% 12.96% D E Market Portfolio 7% 14% 1.96% 2 Expected Return 3 St

B7 - X fx =B6/B4 А B 2 Expected Return 3 Standard Deviation 4. Variance Stock A 0.04 0.18 =B3^2 Stock B 0.12 0.36 =C312 Marke

b.

Using CAPM

Expected Stock Return = Risk Free Rate +Beta*(Market Returns - Risk Free Rate)

Risk free rate = [Expected Stock return - Beta*Market Return]/(1 - Beta)

B9 - X V fx =(B2-B7*D2)/(1-B7) B Stock A 4% 18% 3.24% C Stock B 12% 36% 12.96% D E Market Portfolio 7% 14% 1.96% 0.20 2 Expec

B9 - x fc =(B2-B7*D2)/(1-B7) А. B. 1 2 Expected Return 3 Standard Deviation 4 Variance Stock A 0.04 0.18 =B3^2 Stock B 0.12 0

c.

Using CAPM

Beta = (Expected Return - Risk Free Rate)/(Market Returns - Risk Free Rate)

Portfolio Beta = weightof stock * betaof stock

C15 - x = fx =SUMPRODUCT(B13:B14,013:C14) F G 1 B Stock A 4% 18% 3.24% C Stock B 12% 36% 12.96% D E Market Portfolio 7% 14% 1

C15 - : X V fc =SUMPRODUCT(B13:B14,C13:C14) А B 1 2 Expected Return 3 Standard Deviation 4 Variance Stock A 0.04 0.18 =B3^2 S

D.

Idiosyncratic Volatility = Total Variance - Market Variance

B17 : x fi =D3-B16 А E р Market Portfolio 1 в в Stock A 4% 18% 3.24% 2 Expected Return 3 Standard Deviation 4 Variance с Stoc

B17 - X V fx =D3-B16 2 Expected Return 3 Standard Deviation 4. Variance Stock A 0.04 0.18 =B312 Stock B 0.12 0.36 =C312 Marke

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