Question

You are considering the following investing in a US stock index fund and a US bond...

You are considering the following investing in a US stock index fund and a US bond index fund. These represent the only 2 investments available to you at this time. You have the following additional information:

US Stocks

US Bonds

Expected Return

25%

15%

Standard Deviation

27%

20%

Variance

0.0729

0.0400

PS,B

0.70

Covariance (S,B)

0.0378

Calculate the weights for stocks and bonds for the minimum variance portfolio. Show your work (if you are using Excel, include a screenshot of your Solver setup).

Suppose you have a target expected return of 17% for your portfolio.

i.      Calculate the weights of the Stock/Bond portfolio that satisfies this requirement.

   ii.      Calculate the standard deviation of your target portfolio Show your work.

Homework Answers

Answer #1
i) Optimum Weights of Minimum Portpolio Risk
Weights (B) (s.d.(S)^2 - Covariance(S,B)) / (s.d.(B) ^2) + (S.d.(S)^2) - 2Coveraince (S,B)
= (0.27*0.27)-0.0378 / ((0.2*0.2) + (0.27*0.27)-(2*0.0378))
= 0.941019
= 94.10%
Weights (S) 1-0.941
= 5.90%
ii) Weights when Target Return =17%
R(portpoilo)=(R(stocks)* W(Stocks) )+(R(Bonds)* W(Bonds) )
17%=(25%*X)+15% (1-X) Let W(Stocks)=X
X=20%
W(Stocks)=20%
W(Bonds)=80%
iii) S.D. of target potpolio
P(S,B) 0.7
= ((s.d.(S)*w(S))^2 + (s.d.(B)*w(B))^ 2 + (2 *s.d.(S)*w(S)*s.d.(B)*w(B)*p(S,B))) ^1/2
= (((0.27*0.2)^ 2)+((0.2*0.8) ^2 ) + 2 *(0.27*0.2)*(0.2*0.8)*0.7)^1/2
= 0.020306
S.D. of target potpolio 0.2
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