Reference no: EM131147048
a. Assume that security returns are generated by the single-index model, Ri = ai + ßiRM + ei, where Ri is the excess return for security i and RM is the market's excess return. The risk-free rate is 2%. Suppose also there are 3 securities A, B and C, characterized by the following data:
Security ßi E(Ri) s(ei)
A 0.8 10% 25%
B 1.0 12% 10%
C 1.2 14% 20%
(i) If sM = 20%, help Caillou calculate the variance of returns of securities A, B and C.
(ii) Now assume there are an infinite number of assets with return characteristics identical to those of A, B and C, respectively. If one forms a well-diversified portfolio of type A securities, what will be the mean and variance of the portfolio's excess returns? What about portfolios composed only of type B and type C stocks?
(iii) Is there an arbitrage opportunity in the market? If so, show Caillou the money.
b. Assume the correlation coefficient between the Sid Science Fund and the S&P/TSX index is 0.70. What percentage of Sid Science Fund's total risk is specific or unsystematic?
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