3. A canonical utility function. Consider the utility function u(c) 1-σ where c denotes consumption of some arbitrary good and ơ (Greek lowercase letter sigma") is known as the "curvature parameter" because its value governs how curved the utility function is. In the following, restrict your attention to the region c> (because "negative consumption" is an ill-defined concept). The parameter σ is treated as a constant. Plot the utility function for ơ-0. Does this utility function display diminishing marginal utility? Is marginal utility ever negative for this utility function? Plot the utility function for ơ marginal utility? Is marginal utility ever negative for this utility function? Consider instead the natural-log utility function u(c)=In(c). Does this utility function display diminishing marginal utility? Is marginal utility for this utility function? Determine the value of σ (if any value exists at all) that makes the general utility function presented above collapse to the natural-log utility function in part c. (Hint: Examine the derivatives of the two functions.) a. b. 2. Does this utility function display diminishing c. ever negative d.

Question
Asked Feb 3, 2019
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3.
A canonical utility function. Consider the utility function
u(c)
1-σ
where c denotes consumption of some arbitrary good and ơ (Greek lowercase letter
sigma") is known as the "curvature parameter" because its value governs how curved
the utility function is. In the following, restrict your attention to the region c>
(because "negative consumption" is an ill-defined concept). The parameter σ is treated
as a constant.
Plot the utility function for ơ-0. Does this utility function display diminishing
marginal utility? Is marginal utility ever negative for this utility function?
Plot the utility function for ơ
marginal utility? Is marginal utility ever negative for this utility function?
Consider instead the natural-log utility function u(c)=In(c). Does this utility
function display diminishing marginal utility? Is marginal utility
for this utility function?
Determine the value of σ (if any value exists at all) that makes the general utility
function presented above collapse to the natural-log utility function in part c.
(Hint: Examine the derivatives of the two functions.)
a.
b.
2. Does this utility function display diminishing
c.
ever negative
d.

Image Transcription

3. A canonical utility function. Consider the utility function u(c) 1-σ where c denotes consumption of some arbitrary good and ơ (Greek lowercase letter sigma") is known as the "curvature parameter" because its value governs how curved the utility function is. In the following, restrict your attention to the region c> (because "negative consumption" is an ill-defined concept). The parameter σ is treated as a constant. Plot the utility function for ơ-0. Does this utility function display diminishing marginal utility? Is marginal utility ever negative for this utility function? Plot the utility function for ơ marginal utility? Is marginal utility ever negative for this utility function? Consider instead the natural-log utility function u(c)=In(c). Does this utility function display diminishing marginal utility? Is marginal utility for this utility function? Determine the value of σ (if any value exists at all) that makes the general utility function presented above collapse to the natural-log utility function in part c. (Hint: Examine the derivatives of the two functions.) a. b. 2. Does this utility function display diminishing c. ever negative d.

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