TY  - JOUR
IS  - 1
PB  - Elsevier
JF  - Economics Letters
N2  - 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.
EP  - 15
ID  - eprints3884
SN  - 0165-1765
KW  - Normal goods; Bordered Hessian
VL  - 108
Y1  - 2010///
UR  - http://doi.org/10.1016/j.econlet.2010.03.005
A1  - Bilancini, Ennio
A1  - Boncinelli, Leonardo
TI  - Preferences and normal goods: An easy-to-check necessary and sufficient condition
SP  - 13
AV  - none
ER  -