<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Preferences and normal goods: An easy-to-check necessary and sufficient condition"^^ . "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."^^ . "2010" . . "108" . "1" . . "Elsevier"^^ . . . "Economics Letters"^^ . . . "01651765" . . . . . . . . . . "Ennio"^^ . "Bilancini"^^ . "Ennio Bilancini"^^ . . "Leonardo"^^ . "Boncinelli"^^ . "Leonardo Boncinelli"^^ . . . . . "HTML Summary of #3884 \n\nPreferences and normal goods: An easy-to-check necessary and sufficient condition\n\n" . "text/html" . . . "HB Economic Theory"@en . .