A portfolio has a E[r] of 12% and a std deviation of 18%. T-Bills return 7%. What is the maximum level of risk aversion (A) for which the risky portfolio is still preferred to T…

Question

asked Aug 28, 2021 227k views

1 Answer

Joseph Lisee · Answer 1 · 2021-09-03T22:53:08+0000

Explanation:

Given,

A portfolio has a E[r] = 12 %, and

A standard deviation (
$\sigma$ ) = 18 %

We know that,

Specify utility by U = E(r) – 0.5A
$\sigma^2$

U = 0.12– 0.5(A) ×
0.18^2

= 0.12 - 0.5 × A × 0.0162

In order for the risky portfolio to be preferred to bills,

The following condition must have:

0.12 – 0.0162A > 0.07

⇒ A <
(0.05)/(0.0162) = 3.09

A must be less than 3.09 for the risky portfolio to be preferred to bills.

Thus, the required "option D) 3.09" is correct.