In: Finance
Assume that security returns are generated by the single-index model,
Ri = αi + βiRM + ei
where Ri is the excess return for security i and RM is the market’s excess return. The risk-free rate is 4%. Suppose also that there are three securities A, B, and C, characterized by the following data:
Security | βi | E(Ri) | σ(ei) |
A | 1.3 | 14% | 27% |
B | 1.5 | 16 | 13 |
C | 1.7 | 18 | 22 |
a. If σM = 22%, calculate the variance of returns of securities A, B, and C. (Do not round intermediate calculations. Round your answers to the nearest whole number.)
Variance | |
Security A | |
Security B | |
Security C | |
b. Now assume that 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 or C stocks? (Enter the variance answers as a percent squared and mean as a percentage. Do not round intermediate calculations. Round your answers to the nearest whole number.)
Mean | Variance | |
Security A | % | |
Security B | % | |
Security C | % | |