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Estimating Elasticities with the Linear Approximate Almost Ideal Demand System: Some Monte Carlo Results

Julian M. Alston, Kenneth A. Foster and Richard D. Gree
The Review of Economics and Statistics
Vol. 76, No. 2 (May, 1994), pp. 351-356
Published by: The MIT Press
DOI: 10.2307/2109891
Stable URL: http://www.jstor.org/stable/2109891
Page Count: 6
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Estimating Elasticities with the Linear Approximate Almost Ideal Demand System: Some Monte Carlo Results
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Abstract

The AIDS model has many desirable theoretical properties but usually it is estimated using a linear approximation. The quality of the approximation to the true AIDS depends on the parameters and the collinearity among the exogenous price variables. In the literature four alternative formulas have been used to compute elasticities of a demand system that is assumed to be of the AIDS form, using parameters estimated in the linear approximate AIDS. Monte Carlo experiments indicate that two of those four alternatives, as typically applied, are highly inaccurate but the other two are quite accurate.

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