2. (Measures of Risk Aversion in EUT) In class we discussed the Arrow-Pratt coefficient of absolute risk aversion: u"(x) u'(x) r(x) = Another measure of risk aversion that is often used is the Arrow-Pratt coefficient of relative risk aversion: xu" (x) u'(x) q(x) = Both measures capture different aspects of risk aversion. One way to see the difference is to consider an agent who has a budget to allocate to a portfolio of a safe asset (a bond) and a risky asset (a stock). The higher r(r), the more dollars the agent will allocate to the bond. The higher q(z), the bigger the share of the agent's portfolio that will be allocated to the bond.

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Chapter14: Transaction Costs, Asymmetric Information, And Behavioral Economics
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2. (Measures of Risk Aversion in EUT) In class we discussed the Arrow-Pratt coefficient
of absolute risk aversion:
r(x):
Another measure of risk aversion that is often used is the Arrow-Pratt coefficient of
relative risk aversion:
q(x) =
u₁(x) = 1- ep
• U₂(x) =
21-P-1
1-p
• Uz(x) = ln(x)
==
• u₁(x) = ax
• u₁(x) = x-ax²
u"(x)
u'(x)
Both measures capture different aspects of risk aversion. One way to see the difference
is to consider an agent who has a budget to allocate to a portfolio of a safe asset (a
bond) and a risky asset (a stock). The higher r(x), the more dollars the agent will
allocate to the bond. The higher q(z), the bigger the share of the agent's portfolio that
will be allocated to the bond.
1
Tu" (x)
u'(x)
The questions below refer to the following utility functions, which are often used in
applications. Here is the agent's income or wealth, and p and a are parameters:
(a) Calculate r(x) and g(x) for each of the above utility functions.
(b) Are r(r) and q(z) increasing, decreasing, or constant with respect to z in
each of the above cases?
Transcribed Image Text:2. (Measures of Risk Aversion in EUT) In class we discussed the Arrow-Pratt coefficient of absolute risk aversion: r(x): Another measure of risk aversion that is often used is the Arrow-Pratt coefficient of relative risk aversion: q(x) = u₁(x) = 1- ep • U₂(x) = 21-P-1 1-p • Uz(x) = ln(x) == • u₁(x) = ax • u₁(x) = x-ax² u"(x) u'(x) Both measures capture different aspects of risk aversion. One way to see the difference is to consider an agent who has a budget to allocate to a portfolio of a safe asset (a bond) and a risky asset (a stock). The higher r(x), the more dollars the agent will allocate to the bond. The higher q(z), the bigger the share of the agent's portfolio that will be allocated to the bond. 1 Tu" (x) u'(x) The questions below refer to the following utility functions, which are often used in applications. Here is the agent's income or wealth, and p and a are parameters: (a) Calculate r(x) and g(x) for each of the above utility functions. (b) Are r(r) and q(z) increasing, decreasing, or constant with respect to z in each of the above cases?
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