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Exponential utility implies constant absolute risk aversion (CARA), with coefficient of absolute risk aversion equal to a constant: ″ ′ =. In the standard model of one risky asset and one risk-free asset, [1] [2] for example, this feature implies that the optimal holding of the risky asset is independent of the level of initial wealth; thus on the margin any additional wealth would be ...
Isoelastic utility for different values of . When > the curve approaches the horizontal axis asymptotically from below with no lower bound.. In economics, the isoelastic function for utility, also known as the isoelastic utility function, or power utility function, is used to express utility in terms of consumption or some other economic variable that a decision-maker is concerned with.
A possible solution is to calculate n one-dimensional cardinal utility functions - one for each attribute. For example, suppose there are two attributes: apples and bananas (), both range between 0 and 99. Using VNM, we can calculate the following 1-dimensional utility functions:
The power utility function occurs if < and =. The more special case of the isoelastic utility function, with constant relative risk aversion, occurs if, further, b = 0. The logarithmic utility function occurs for = as goes to 0.
A single-attribute utility function maps the amount of money a person has (or gains), to a number representing the subjective satisfaction he derives from it. The motivation to define a utility function comes from the St. Petersburg paradox: the observation that people are not willing to pay much for a lottery, even if its expected monetary gain is infinite.
A consumer's indirect utility (,) can be computed from their utility function (), defined over vectors of quantities of consumable goods, by first computing the most preferred affordable bundle, represented by the vector (,) by solving the utility maximization problem, and second, computing the utility ((,)) the consumer derives from that ...
The expenditure function is the inverse of the indirect utility function when the prices are kept constant. I.e, for every price vector and income level : [1]: 106 (, (,)) There is a duality relationship between expenditure function and utility function.
A Cobb-Douglas utility function (see Cobb-Douglas production function) with two goods and income generates Marshallian demand for goods 1 and 2 of = / and = /. Rearrange the Slutsky equation to put the Hicksian derivative on the left-hand-side yields the substitution effect:
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