Question

In: Finance

Assume that security returns are generated by the single-index model, Ri = αi + βiRM +...

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 %

Solutions

Expert Solution

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