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Epargne, investissement et monnaie dans une perspective intertemporelle

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  • Philippe Michel
  • Antoine d'Autume

Abstract

[eng] Saving, investment and mcwey in an intertemporal setting . Antoine D'autume, Philippe Michel. Following recent work of O. J. Blanchard and J. Sachs, we analyze perfect foresight equilibria in a model where both a producer and a consumer solve an intertemporal optimization problem. We show that in an infinite horizon setting there exist different specifications of the solvability constraint which are all equivalent. We also analyze the optimal investment behavior in presence of adjustment costs, and we offer a new proof of Hayashi's result which states the equality of the marginal and average values of Tobin's « q ». We then analyze the competitive equilibria, in the special case of a separable utility function. We show that the determinacy or indeterminacy of the rational expectations equilibrium strongly depends on the specification of the government budget constraint. [fre] On étudie ici, à la suite notamment des travaux de O. Blanchard et J. Sachs, un modèle d'équilibre avec prévision parfaite où simultanément producteur et consom­mateur résolvent un problème intertemporel d'optimisation. L'accent est mis d'abord sur l'étude des comportements individuels. Nous montrons qu'il existe en horizon infini plusieurs façons équivalentes et rigoureuses de spécifier la contrainte de solvabilité que doit respecter chaque agent. Nous étudions également le comportement d'investissement optimal en présence de coûts d'ajustement et nous présentons une démonstration nouvelle du résultat d'Hayashi concernant l'égalité des valeurs marginale et moyenne du facteur « q » de Tobin. Nous étudions ensuite les équilibres du modèle en nous limitant au cas d'une fonction d'utilité séparable. Nous montrons que le caractère déterminé ou indéterminé de l'équilibre avec anticipations rationnelles dépend crucialement de la façon dont on impose à l'Etat le respect de sa contrainte budgétaire intertemporelle.

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  • Philippe Michel & Antoine d'Autume, 1985. "Epargne, investissement et monnaie dans une perspective intertemporelle," Revue Économique, Programme National Persée, vol. 36(2), pages 243-290.
  • Handle: RePEc:prs:reveco:reco_0035-2764_1985_num_36_2_408841
    DOI: 10.3406/reco.1985.408841
    Note: DOI:10.3406/reco.1985.408841
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    8. Hayashi, Fumio, 1982. "Tobin's Marginal q and Average q: A Neoclassical Interpretation," Econometrica, Econometric Society, vol. 50(1), pages 213-224, January.
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    1. Antoine d'Autume, 1986. "Les anticipations rationnelles dans l'analyse macro-économique," Revue Économique, Programme National Persée, vol. 37(2), pages 243-284.
    2. Plassard, Romain, 2021. "Barro, Grossman, and the domination of equilibrium macroeconomics," MPRA Paper 107201, University Library of Munich, Germany.
    3. Daniel Cohen & Jeffrey Sachs, 1991. "Growth and External Debt Under Risk of Debt Repudiation," NBER Chapters, in: International Volatility and Economic Growth: The First Ten Years of The International Seminar on Macroeconomics, pages 437-472, National Bureau of Economic Research, Inc.

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