In: Finance
Refer the table below on the average risk premium of the S&P 500 over T-bills and the standard deviation of that risk premium. Suppose that the S&P 500 is your risky portfolio.
Average Annual Returns | S&P 500 Portfolio | ||||||||||||||||||
Period | S&P 500 Portfolio |
1-Month T-Bills |
Risk Premium |
Standard Deviation |
Sharpe Ratio |
||||||||||||||
1926–2015 | 11.77 | 3.47 | 8.30 | 20.59 | 0.40 | ||||||||||||||
1992–2015 | 10.79 | 2.66 | 8.13 | 18.29 | 0.44 | ||||||||||||||
1970–1991 | 12.87 | 7.54 | 5.33 | 18.20 | 0.29 | ||||||||||||||
1948–1969 | 14.14 | 2.70 | 11.44 | 17.67 | 0.65 | ||||||||||||||
1926–1947 | 9.25 | 0.91 | 8.33 | 27.99 | 0.30 | ||||||||||||||
a. If your risk-aversion coefficient is A = 4 and you believe that the entire 1926–2015 period is representative of future expected performance, what fraction of your portfolio should be allocated to T-bills and what fraction to equity? Assume your utility function is U = E(r) – 0.5 × Aσ2. (Do not round intermediate calculations. Round your answers to 2 decimal places.)
b. If your risk-aversion coefficient is A = 4 and you believe that the entire 1970–1991 period is representative of future expected performance, what fraction of your portfolio should be allocated to T-bills and what fraction to equity? (Do not round intermediate calculations. Round your answers to 2 decimal places.)