Mr X can invest in two financial securities, security A and security B. The table below gives
Question:
Mr X can invest in two financial securities, security A and security B. The table below gives a description of the states of the world, their respective probabilities and the return of each security in each state.
State: Bear Normal Bull
Probability of state 20% 40% 40%
Return of security A - 40% 0% 100%
Return of security B -6% 10% 20%
a. Find the expected return and the standard deviation of returns of a portfolio which places weight 30% in security A and 70% in security B.
b. risk-free interest rate is RF=2%, estimate the optimal risky portfolio for the investor when short sales are allowed.
c. Suppose that there is a third security, security C. Its return is -10% when the market is Bear, and 10% when the market is Normal. When the market is Bull, security C has 50% chance to give a return of 20% and 50% to give a return of 100%. Find the optimal risky portfolio for Mr X. when he can invest in securities A, B, and C and short sales are allowed.
Quantitative Investment Analysis
ISBN: 978-1119104223
3rd edition
Authors: Richard A. DeFusco, Dennis W. McLeavey, Jerald E. Pinto, David E. Runkle