Now consider the case where both Boris and Angela can invest in a risk-free asset. The risk-free rate is 0.5% per month. Estimate the optimal combined portfolio for each investor using the five industries in part 3 and then estimate the optimal combined portfolio for each investor using all eleven industries. How does the existence of the risk-free rate affect your conclusion regarding diversification benefits? Are diversification benefits increased or reduced if the investors can borrow or lend at the risk-free rate?

 

 

Investor utility is represented by: U = E(R) Ao. There are two investors with different risk aversion coefficients (A). Angela has a risk aversion coefficient of 5 and Boris has a risk aversion coefficient of 2. Investors are able to short-sell each industry throughout the report. Investors are unable to borrow or lend at the risk-free rate except for part 5 of the report. The expected returns per month to be used throughout the report are in the following table. Do not use historical average returns as expected returns. You need to use the historical returns to estimate the covariance matrix. Industry Consumer Discretionary Consumer Staples Energy Health Care Industrials Information Technology Materials Telecom Utilities Financials Real Estate Abbreviation COND CONS ENGY HC INDU IT MATL TELE UTIL FIN RE Expected Return (per month) 0.96% 0.83% 1.09% 0.86% 0.92% 1.00% 0.87% 0.90% 0.80% 0.90% 0.96%