Preferences and normal goods: A sufficient condition |
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| Institution: | 1. Dipartimento di Scienze Economiche e Statistiche, University of Naples Federico II, Italy;2. Dipartimento di Studi Aziendali e Quantitativi, University of Naples Parthenope, Italy;1. Department of Nuclear Science and Engineering, College of Materials Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, People’s Republic of China;2. Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou 215000, People’s Republic of China;1. Department of Economics, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong;2. Department of Economics, Hong Kong University of Science and Technology, Hong Kong;3. School of International Trade and Economics, University of International Business and Economics, China;1. University of Glasgow, UK;2. Institute for Social and Economic Change, Bangalore, India |
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| Abstract: | This note contains a sufficient condition for all goods to be normal, in the case of differentiable individual demand. This condition appears as a relationship between the first and second partial derivatives of the utility function. But it is shown that this condition is independant of the utility function chosen and, then, is a characteristic of the preference order. |
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