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Original Articles

Functional form bias in goodness-of-fit optimizing models

Pages 13-15 | Published online: 05 Oct 2010
 

Abstract

Following the weak axiom of revealed preference (WARP), developed by Varian, a money-metric expenditure function is derived for a CES utility function in this paper. Using the US aggregate data on consumption used by Varian, the money-metric expenditure function is estimated to calculate an efficiency index measuring the magnitude of departure from the optimum expenditures. The results are then compared to those reported by Varian for a Cobb-Douglas utility function. The findings point to a sizeable bias in the calculated efficiency index in the near-optimization analysis as determined by the choice of the functional form.

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