# Preferences and normal goods: An easy-to-check necessary and sufficient condition

Bilancini, Ennio and Boncinelli, Leonardo Preferences and normal goods: An easy-to-check necessary and sufficient condition. Economics Letters, 108 (1). pp. 13-15. ISSN 0165-1765 (2010)

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## Abstract

We provide a necessary and sufficient condition for goods to be normal when utility functions are differentiable and strongly quasi-concave. Our condition is equivalent to the condition proposed by Alarie et al. (1990), but it is easier to check: it only requires to compute the minors associated with the border column (or row) of the bordered Hessian matrix of the utility function.

Item Type: Article 10.1016/j.econlet.2010.03.005 Normal goods; Bordered Hessian H Social Sciences > HB Economic Theory Economics and Institutional Change Caterina Tangheroni 24 Jan 2018 12:09 24 Jan 2018 12:09 http://eprints.imtlucca.it/id/eprint/3884