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Les représentations implicites des goûts dans les modèles dynamiques de demande

Author

Listed:
  • Jean-Marc Robin

    (ECON - Département d'économie (Sciences Po) - Sciences Po - Sciences Po - CNRS - Centre National de la Recherche Scientifique)

  • Louis Lévy-Garboua

    (CES - Centre d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique)

Abstract

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 nonvérification de cette hypothèse par la théorie de la demande sont alors analysées en détail.

Suggested Citation

  • Jean-Marc Robin & Louis Lévy-Garboua, 1988. "Les représentations implicites des goûts dans les modèles dynamiques de demande," SciencePo Working papers Main hal-01026497, HAL.
  • Handle: RePEc:hal:spmain:hal-01026497
    DOI: 10.2307/3502066
    Note: View the original document on HAL open archive server: https://sciencespo.hal.science/hal-01026497
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