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Elasticities in AIDS Models
Author(s) -
Green Richard,
Alston Julian M.
Publication year - 1990
Publication title -
american journal of agricultural economics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.949
H-Index - 111
eISSN - 1467-8276
pISSN - 0002-9092
DOI - 10.2307/1242346
Subject(s) - almost ideal demand system , ideal (ethics) , variety (cybernetics) , econometrics , economics , mathematics , mathematical economics , statistics , demand management , macroeconomics , philosophy , epistemology
Abstract In the literature, a variety of approaches have been used to calculate demand elasticities in almost ideal demand system (AIDS) models of demand. It is common to estimate the linear approximate almost ideal demand system (LA/AIDS) instead of the AIDS. When the LA/AIDS is estimated, all of the previously reported approaches to compute elasticities are theoretically incorrect. This paper presents correct formulas for LA/AIDS elasticities and illustrates the potential errors from using incorrect computing formulas.