(a) Find a as a function of w. How does a change with wealth? Explain the intuition. (b) Another investor has the utility function u(x) = ln(x). How does a change with wealth? Explain the intuition.

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter7: Uncertainty
Section: Chapter Questions
Problem 7.9P
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Consider the following portfolio choice problem. The investor has initial wealth w and
utility u(x) = -e-. There is a safe asset (such as a US government bond) that has net
real return of zero. There is also a risky asset with a random net return that has only
two possible returns, R₁ with probability 1 − q and Ro with probability q. We assume
R₁ < 0, Ro > 0. Let a be the share of wealth w invested in the risky asset, so that 1 – a
share of wealth is invested in the safe asset.
(a) Find a as a function of w. How does a change with wealth? Explain the intuition.
(b) Another investor has the utility function u(x) = ln(x). How does a change with
wealth? Explain the intuition.
Transcribed Image Text:Consider the following portfolio choice problem. The investor has initial wealth w and utility u(x) = -e-. There is a safe asset (such as a US government bond) that has net real return of zero. There is also a risky asset with a random net return that has only two possible returns, R₁ with probability 1 − q and Ro with probability q. We assume R₁ < 0, Ro > 0. Let a be the share of wealth w invested in the risky asset, so that 1 – a share of wealth is invested in the safe asset. (a) Find a as a function of w. How does a change with wealth? Explain the intuition. (b) Another investor has the utility function u(x) = ln(x). How does a change with wealth? Explain the intuition.
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