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Les représentations implicites des goûts dans les modèles dynamiques de demande

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  • Jean-Marc Robin
  • Louis Lévy-Garboua

Abstract

[fre] Les représentations implicites des goûts dans les modèles dynamiques de demande. . La théorie micro-économique entend réduire au maximum le nombre d'hypothèses sur les goûts nécessaire à la construction des modèles de demande. Néanmoins aucun modèle n'atteint jamais la généralité absolue et certaines hypothèses sont même devenues tellement usuelles qu'on ne prend généralement guère la peine sinon de les expliciter complètement du moins de les discuter. Cet article analyse deux d'entre elles particulièrement utiles dans les modèles dynamiques de demande : la séparabilité intemporelle et la récursivité de la fonction d'utilité.. La forme des préférences conduisant à chaque type particulier d'utilité est d'abord dérivée, nous amenant à définir les conditions équivalentes de séparabilité et de récursivité applicables aux préordres de préférences. Il est alors montré que si la séparabilité s'accommode fort bien de la récursivité, il n'en va pas de même pour la non-séparabilité. L'hypothèse de formation d'habitudes myopes, vraisemblable en période d'apprentissage, contredit ainsi la récursivité. Or, la récursivité est par ailleurs particulièrement utile puisque nécessaire à la cohérence intertemporelle des comportements de consommation. Les conséquences de la non-vérification de cette hypothèse par la théorie de la demande sont alors analysées en détail. [eng] Two traditional assumption of dynamic demand models intertemporal separability and the recursivity of the utility function are here analyzed in detail .The kind of preferences underlying each utility function is first derived. We show that if separability easily accepts recursivity it is not the case for non-separability. Myopic habits likely assumption during learning periods contradicts recursivity. But recursivity is on another hand particularly useful since necessary condition of intertemporal consistency of consumption behavior. The consequences of non verifying this assumption fort the theory of demand are then fully examined

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  • Jean-Marc Robin & Louis Lévy-Garboua, 1988. "Les représentations implicites des goûts dans les modèles dynamiques de demande," Revue Économique, Programme National Persée, vol. 39(1), pages 33-55.
    • Handle: RePEc:prs:reveco:reco_0035-2764_1988_num_39_1_409041
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