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Expenditure FunctionIn microeconomics, a consumer's expenditure function describes how much money a consumer needs to be happy. That is, given a utility function and prices, it says how much wealth the consumer would need to reach a desired utility level. Formally, if there is a utility function that describes preferences over L commodities, the expenditure function -
\rightarrow \textbf R says what amount of money is needed to achieve a utility if prices are set by . This function is defined by -
where -
is the set of all packages that give utility at least as good as . See also
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