Question 4

Lisbon is indifferent between investing all her wealth (which is $1 million) in the risky asset and the

risk-free asset. The risky asset has an expected rate of return of 10% per year and a standard deviation

of 20% per year.

The risk-free lending rate is 4% per year. The risk-free borrowing rate is 6%. Answer the following

questions.

a) Compute Lisbons risk aversion coefficient (A).

[Hint: Note the meaning of lending rate and borrowing rate and recall the utility function that we

covered in class. You may want to look at Bodie to get a better idea of the utility function to avoid

calculation error.]

b) Determine the optimal mix of the risky and the risk-free asset for Lisbon given your answer to (a).

c) Mr. Jane (full name: Patrick Jane), a friend of Lisbon, is a hedge fund manager. He offers a truly

risk-free investment opportunity of 7% per year to Lisbon, provided she can invest a minimum of

$1 million. Lisbon realizes that in order to take advantage of this opportunity, she has to invest all

her wealth with Patrick.

Should Lisbon invest all her wealth with Patrick earning a risk-free rate of 7% instead of holding

the optimal mix computed in (b) above? Explain.

[Hint: Lisbon is essentially choosing between a risk-free and risky asset.]