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A Nonparametric Test of Slutsky Symmetry

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  • Florian Gunsilius
  • Lonjezo Sithole

Abstract

Economic theory implies strong limitations on what types of consumption behavior are considered rational. Rationality implies that the Slutsky matrix, which captures the substitution effects of compensated price changes on demand for different goods, is symmetric and negative semi-definite. While negative semi-definiteness has been shown to be nonparametrically testable, a fully nonparametric test of symmetry has remained elusive due to the inherent multidimensionality of the problem. Recently, it has even been shown that the symmetry condition is not testable via the average Slutsky matrix, prompting conjectures about its non-testability. We settle this question by deriving nonparametric conditional quantile restrictions on observable data that permit construction of a fully nonparametric test for the symmetry condition. The theoretical contribution is a multivariate extension of identification results for partial effects in nonseparable models without monotonicity, which is of independent interest. The derived conditional restrictions induce challenges related to generated regressors and multiple hypothesis testing, which can be addressed using recent statistical methods. Our results provide researchers with the missing tool in many econometric models that rely on Slutsky matrices: from welfare analysis with individual heterogeneity to testing an empirical version of rationality in consumption behavior.

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  • Florian Gunsilius & Lonjezo Sithole, 2025. "A Nonparametric Test of Slutsky Symmetry," Papers 2505.05603, arXiv.org.
  • Handle: RePEc:arx:papers:2505.05603
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