dai, i=1,2,3. dp12 Denote the effect of a change in the correlation P12 on the demands for assets as

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter7: Uncertainty
Section: Chapter Questions
Problem 7.8P
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course: advanced microeconomics

An individual has 1 Dollar to invest. Her mean-variance utility function is U = M-V, where M is the
portfolio's mean and V is its variance. There are three risky assets with means ₁ = µ2 = µ3 = 1% and
standard deviations $1 = S2 = S3 = 1. The correlation between the returns on assets 1 and 2 is P12, where
−1 ≤ P12 ≤ 1, but P12 # 0. The returns on assets 1 and 3 and 2 and 3 are uncorrelated (P13 = P23 = 0).
Denote the effect of a change in the correlation P12 on the demands for assets as
dxi i = 1,2,3. Then,
dp12'
we have:
(a) > 0,
dx₁
dp12
dx₁ <0,
dx2
dp12
> 0, but
(b) dp 12
(c)
dx₁ <0,
dp12
(d) the signs of
dx20, but
dp12
dx2 < 0,
dp12
dx₁
dp12 •
dx3
dp 12
dx3
dp12
dx3
dp12
but
dx2 and
dp 12
<0
>0
0
=
da3 depend on the sign of P12
dp12
Transcribed Image Text:An individual has 1 Dollar to invest. Her mean-variance utility function is U = M-V, where M is the portfolio's mean and V is its variance. There are three risky assets with means ₁ = µ2 = µ3 = 1% and standard deviations $1 = S2 = S3 = 1. The correlation between the returns on assets 1 and 2 is P12, where −1 ≤ P12 ≤ 1, but P12 # 0. The returns on assets 1 and 3 and 2 and 3 are uncorrelated (P13 = P23 = 0). Denote the effect of a change in the correlation P12 on the demands for assets as dxi i = 1,2,3. Then, dp12' we have: (a) > 0, dx₁ dp12 dx₁ <0, dx2 dp12 > 0, but (b) dp 12 (c) dx₁ <0, dp12 (d) the signs of dx20, but dp12 dx2 < 0, dp12 dx₁ dp12 • dx3 dp 12 dx3 dp12 dx3 dp12 but dx2 and dp 12 <0 >0 0 = da3 depend on the sign of P12 dp12
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