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This is a comprehensive problem solving question about asset allocation. The ultimate goal is to find the optimal asset allocation in a simplified scenario with TWO risky-assets (stocks) and one risk-free asset. We will break down this huge question into several steps, which may help you understand the important concepts related to the problem. Information about the assets is provided below. . There are two stocks available on the market, Stock A and Stock B. There are no restrictions on stock trading, which means you may buy stocks, short-sale stocks, or buy on margin. The expected return and volatility of the two stocks are calculated using historic data, and are provided as follows Stock A: Expected return E[TA] = 8%, volatility A = 10% Stock B: Expected return E [TB] = 10%, volatility B = 15% The correlation between the returns of the two stocks is given by PAB = 0.5 • The rate on the risk-free asset is fixed at rf = 5%. You may invest in the risk-free asset and earn the risk-free rate, or you may also borrow from the risk-free asset and pay the same rate. • Suppose you have mean-variance preference and your utility function has the following form where your risk aversion coefficient is A = 5. U = E[r] — — Ao² (a) Suppose for some reason you refuse to invest in Stock B (e.g., you really dislike the CEO of Firm B). As a result, your may invest only in Stock A and the risk-free asset. Please follow the steps below to find the optimal asset allocation between stock A and the risk-free asset, and then calculate the maximum utility. i. Suppose you invest a fraction w₁ of your money in Stock A and 1- w in the risk-free asset. What is your portfolio expected return and volatility as a function of wA? ii. What is the utility score of the portfolio in (i) as a function of wĄ? iii. What is the optimal weight in Stock A, w, that maximizes your utility? (Hint: w* = iv. Given the optimal weight w in (iii), what is your expected return and volatility on this optimized portfolio? v. Calculate the utility score of the optimized portfolio in (iv). Keep in mind this is the highest utility you can achieve by investing in Stock A and the risk-free asset only. (b) Now instead, suppose for some reason you refuse to invest in Stock A. As a result, your may invest only in Stock B and the risk-free asset. Now what is the maximum utility you can get? Elrl-ri) Ag2 (c) Comparing (a) and (b), if you can invest only in one stock plus the risk-free asset, will you pick Stock A or Stock B? (d) Now suppose you can invest in both Stock A and Stock B, but not the risk-free asset. In risk-return space (volatility on the horizontal axis and return on the vertical axis), draw an approximation of the set of portfolios combining the two stocks. Label the axis and the two stocks. Label the efficient frontier and the global minimum variance portfolio. Label the risk-free asset as well. W₁ = (e) Among the set of portfolios combining the two stocks as you plotted in (d), the portfolio that has the highest Sharpe ratio is what we call the "tangency portfolio". Use the following formula to calculate the weight of Stock A in the "tangency portfolio". Also calculate the weight of Stock B (which is 1 – w). ETA ETA - Tfo-E [rв -rf] σAOBPAB Tflo+E[rв - rƒ] 0² - (E [TA-Tƒ] + E[rв -rf]) σAºBPAB (f) Following (e), what is the expected return and volatility of the "tangency portfolio" ? What is the Sharpe ratio of the "tangency portfolio"? (g) On the graph of (d), draw the "best" capital allocation line, and label the "tangency portfolio". (h) Finally, we can solve the optimal asset allocation problem with two risky-assets and one risk-free asset. We know that the optimal portfolio is a combination of the risk-free asset and the "tangency portfolio". i. Suppose you invest weight wp in the "tangency portfolio", and 1 – wp in the risk-free asset. Given the expected return and volatility of the "tangency portfolio" in (f), what is the optimal w that maximize your utility? (Hint: w* = E[r]=ri) ii. Remember that the "tangency portfolio" is a combination of Stock A and Stock B, with weight w in Stock A, and 1 - w in Stock B (You have already calculated w in (e).). Given the optimal weight wp, calculate the optimal weight in Stock A and Stock B implied by wp. Also calculate the optimal weight in the risk-free asset. iii. Calculate the expected return and volatility of the optimal portfolio in (ii) that combines Stock A, Stock B, and the risk-free asset. iv. Calculate the utility of the optimal portfolio. This is the maximum utility you can get by investing in the two risk-assets and one risk-free asset. This is a comprehensive problem solving question about asset allocation. The ultimate goal is to find the optimal asset allocation in a simplified scenario with TWO risky-assets (stocks) and one risk-free asset. We will break down this huge question into several steps, which may help you understand the important concepts related to the problem. Information about the assets is provided below. . There are two stocks available on the market, Stock A and Stock B. There are no restrictions on stock trading, which means you may buy stocks, short-sale stocks, or buy on margin. The expected return and volatility of the two stocks are calculated using historic data, and are provided as follows Stock A: Expected return E[TA] = 8%, volatility A = 10% Stock B: Expected return E [TB] = 10%, volatility B = 15% The correlation between the returns of the two stocks is given by PAB = 0.5 • The rate on the risk-free asset is fixed at rf = 5%. You may invest in the risk-free asset and earn the risk-free rate, or you may also borrow from the risk-free asset and pay the same rate. • Suppose you have mean-variance preference and your utility function has the following form where your risk aversion coefficient is A = 5. U = E[r] — — Ao² (a) Suppose for some reason you refuse to invest in Stock B (e.g., you really dislike the CEO of Firm B). As a result, your may invest only in Stock A and the risk-free asset. Please follow the steps below to find the optimal asset allocation between stock A and the risk-free asset, and then calculate the maximum utility. i. Suppose you invest a fraction w₁ of your money in Stock A and 1- w in the risk-free asset. What is your portfolio expected return and volatility as a function of wA? ii. What is the utility score of the portfolio in (i) as a function of wĄ? iii. What is the optimal weight in Stock A, w, that maximizes your utility? (Hint: w* = iv. Given the optimal weight w in (iii), what is your expected return and volatility on this optimized portfolio? v. Calculate the utility score of the optimized portfolio in (iv). Keep in mind this is the highest utility you can achieve by investing in Stock A and the risk-free asset only. (b) Now instead, suppose for some reason you refuse to invest in Stock A. As a result, your may invest only in Stock B and the risk-free asset. Now what is the maximum utility you can get? Elrl-ri) Ag2 (c) Comparing (a) and (b), if you can invest only in one stock plus the risk-free asset, will you pick Stock A or Stock B? (d) Now suppose you can invest in both Stock A and Stock B, but not the risk-free asset. In risk-return space (volatility on the horizontal axis and return on the vertical axis), draw an approximation of the set of portfolios combining the two stocks. Label the axis and the two stocks. Label the efficient frontier and the global minimum variance portfolio. Label the risk-free asset as well. W₁ = (e) Among the set of portfolios combining the two stocks as you plotted in (d), the portfolio that has the highest Sharpe ratio is what we call the "tangency portfolio". Use the following formula to calculate the weight of Stock A in the "tangency portfolio". Also calculate the weight of Stock B (which is 1 – w). ETA ETA - Tfo-E [rв -rf] σAOBPAB Tflo+E[rв - rƒ] 0² - (E [TA-Tƒ] + E[rв -rf]) σAºBPAB (f) Following (e), what is the expected return and volatility of the "tangency portfolio" ? What is the Sharpe ratio of the "tangency portfolio"? (g) On the graph of (d), draw the "best" capital allocation line, and label the "tangency portfolio". (h) Finally, we can solve the optimal asset allocation problem with two risky-assets and one risk-free asset. We know that the optimal portfolio is a combination of the risk-free asset and the "tangency portfolio". i. Suppose you invest weight wp in the "tangency portfolio", and 1 – wp in the risk-free asset. Given the expected return and volatility of the "tangency portfolio" in (f), what is the optimal w that maximize your utility? (Hint: w* = E[r]=ri) ii. Remember that the "tangency portfolio" is a combination of Stock A and Stock B, with weight w in Stock A, and 1 - w in Stock B (You have already calculated w in (e).). Given the optimal weight wp, calculate the optimal weight in Stock A and Stock B implied by wp. Also calculate the optimal weight in the risk-free asset. iii. Calculate the expected return and volatility of the optimal portfolio in (ii) that combines Stock A, Stock B, and the risk-free asset. iv. Calculate the utility of the optimal portfolio. This is the maximum utility you can get by investing in the two risk-assets and one risk-free asset.
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Related Book For
Corporate Finance Core Principles and Applications
ISBN: 978-0077905200
3rd edition
Authors: Stephen Ross, Randolph Westerfield, Jeffrey Jaffe, Bradford
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