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?
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
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)
c.
Using CAPM
Beta = (Expected Return - Risk Free Rate)/(Market Returns - Risk Free Rate)
D.
Idiosyncratic Volatility = Total Variance - Market Variance
Assume that the assumptions of the CAPM hold. The expected return and the standard deviation of...
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