Question

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A pension fund manager is considering three mutual funds. The first is a stock fund, the...

A pension fund manager is considering three mutual funds. The first is a stock fund, the second is a long-term government and corporate bond fund, and the third is a T-bill money market fund that yields a sure rate of 5.3%. The probability distributions of the risky funds are:   

Expected Return Standard Deviation
Stock fund (S) 14 % 43 %
Bond fund (B) 7 % 37 %

The correlation between the fund returns is .0459.


Suppose now that your portfolio must yield an expected return of 12% and be efficient, that is, on the best feasible CAL.


a. What is the standard deviation of your portfolio? (Do not round intermediate calculations. Round your answer to 2 decimal places.)


Standard deviation             %

b-1. What is the proportion invested in the T-bill fund? (Do not round intermediate calculations. Round your answer to 2 decimal places.)


Proportion invested in the T-bill fund             %


b-2. What is the proportion invested in each of the two risky funds? (Do not round intermediate calculations. Round your answers to 2 decimal places.)

Proportion Invested
Stocks %
Bonds %

Solutions

Expert Solution

To find the fraction of wealth to invest in stock 1 that will result in the risky portfolio with

the maximum Sharpe ratio the following formula to determine the weight of debt in risky portfolio should be used

Where
Bond E[R(d)]= 7.00%
Stock E[R(e)]= 14.00%
Bond Stdev[R(d)]= 37.00%
Stock Stdev[R(e)]= 43.00%
Var[R(d)]= 0.1369
Var[R(e)]= 0.1849
T bil Rf= 5.30%
Correl Corr(Re,Rd)= 0.0459
Covar Cov(Re,Rd)= 0.0073
Therefore W(*d)= 0.1755
W(*e)=(1-W(*d))= 0.8245
Expected return of risky portfolio= 12.77%
Risky portfolio std dev = 36.34%

Desired return= 12%
= tbill return*proportion invested in tbill+risky portfolio return *(1-return*proportion invested in tbill)
0.12=0.053*Proportion invested in Tbill+0.1277*(1-Proportion invested in Tbill)
Proportion invested in Tbill (answer b.1)= (0.1277-0.12)/(0.1277-0.053)
=0.1
proportion invested in risky portfolio = 1-*proportion invested in tbill
=0.9
Proportion invested in stock fund (answer b.2)=proportion invested in risky portfolio *weight of stock fund
=0.74
Proportion invested in bond fund (answer b.2)=proportion invested in risky portfolio *weight of bond fund  
=0.1579
std dev of portfolio (answer a) = std of risky portfolio*proportion invested in risky portfolio
0.9*0.3634=32.71%

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