a) First, ignore the fact that rrf depends on whether you are long or short the risk-free asset. Suppose Trf = 2%. Solve for the tangency portfolio. b) Again, ignore the fact that rrf depends on whether you are long or short the risk-free asset. Suppose Trf = 9%. Solve for the tangency portfolio. c) Now, for parts c) to f) of the questions, let's take into account that rrf depends on whether you are long or short the risk-free asset. Draw out the shape of the efficient frontier. (Hint: think about what (E, o) pairs you can achieve via investing positive amounts in the risk-free asset, and investing negative amounts in the risk-free asset (borrowing). You will use your answers to parts A. and B.). The drawing does not need to be to scale, but needs to illustrate correctly the shape of the efficient frontier.

Essentials Of Investments
11th Edition
ISBN:9781260013924
Author:Bodie, Zvi, Kane, Alex, MARCUS, Alan J.
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Chapter1: Investments: Background And Issues
Section: Chapter Questions
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Suppose you are a hedge fund. You are trying to form a portfolio out of 2 risky assets
and a risk-free asset. You can take arbitrarily large long or short positions in the risky assets at no cost.
You can also take arbitrarily larger long or short positions in the risk-free asset; however, the risk-free rate
depends on whether you are lending or borrowing. You can invest positive amounts in the risk-free asset
and make 2% per year. However, if you short the risk-free asset (borrow money), you must pay 9% interest
each year on what you borrow. Formally, let wrf be your portfolio weight on the risk-free asset, and rrf be
the return on the risk-free asset. We have:
2% Wrf > 0
Prf
9% Wrf <0
Asset Expected Return
Standard Deviation
A
10%
12%
В
17%
22%
Assume the correlation between assets A and B is 0.4.
Transcribed Image Text:Suppose you are a hedge fund. You are trying to form a portfolio out of 2 risky assets and a risk-free asset. You can take arbitrarily large long or short positions in the risky assets at no cost. You can also take arbitrarily larger long or short positions in the risk-free asset; however, the risk-free rate depends on whether you are lending or borrowing. You can invest positive amounts in the risk-free asset and make 2% per year. However, if you short the risk-free asset (borrow money), you must pay 9% interest each year on what you borrow. Formally, let wrf be your portfolio weight on the risk-free asset, and rrf be the return on the risk-free asset. We have: 2% Wrf > 0 Prf 9% Wrf <0 Asset Expected Return Standard Deviation A 10% 12% В 17% 22% Assume the correlation between assets A and B is 0.4.
a)
First, ignore the fact that r,rf depends on whether you are long or short the risk-free asset.
Suppose rrf = 2%. Solve for the tangency portfolio.
b)
asset. Suppose rrf = 9%. Solve for the tangency portfolio.
Again, ignore the fact that rrf depends on whether you are long or short the risk-free
Now, for parts c) to f) of the questions, let's take into account that rrf depends on whether
c)
you are long or short the risk-free asset. Draw out the shape of the efficient frontier. (Hint: think about
what (E, o) pairs you can achieve via investing positive amounts in the risk-free asset, and investing
negative amounts in the risk-free asset (borrowing). You will use your answers to parts A. and B.).
The drawing does not need to be to scale, but needs to illustrate correctly the shape of the efficient
frontier.
d)
deviation of 10%. Solve for the optimal portfolio for the client (that is, the weights wA, WB,Wrf which
maximize the client's expected return, conditional on the standard deviation being less than 10%).
Suppose your client wants to maximize returns, but can accept a maximum standard
e)
deviation of 35%. Solve for the optimal portfolio for the client.
Suppose your client wants to maximize returns, but can accept a maximum standard
f)
deviation of 18%. Solve for the optimal portfolio for the client.
Suppose your client wants to maximize returns, but can accept a maximum standard
Transcribed Image Text:a) First, ignore the fact that r,rf depends on whether you are long or short the risk-free asset. Suppose rrf = 2%. Solve for the tangency portfolio. b) asset. Suppose rrf = 9%. Solve for the tangency portfolio. Again, ignore the fact that rrf depends on whether you are long or short the risk-free Now, for parts c) to f) of the questions, let's take into account that rrf depends on whether c) you are long or short the risk-free asset. Draw out the shape of the efficient frontier. (Hint: think about what (E, o) pairs you can achieve via investing positive amounts in the risk-free asset, and investing negative amounts in the risk-free asset (borrowing). You will use your answers to parts A. and B.). The drawing does not need to be to scale, but needs to illustrate correctly the shape of the efficient frontier. d) deviation of 10%. Solve for the optimal portfolio for the client (that is, the weights wA, WB,Wrf which maximize the client's expected return, conditional on the standard deviation being less than 10%). Suppose your client wants to maximize returns, but can accept a maximum standard e) deviation of 35%. Solve for the optimal portfolio for the client. Suppose your client wants to maximize returns, but can accept a maximum standard f) deviation of 18%. Solve for the optimal portfolio for the client. Suppose your client wants to maximize returns, but can accept a maximum standard
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