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On Rational Exuberance

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  • Stefano Bosi

    (EQUIPPE - Economie Quantitative, Intégration, Politiques Publiques et Econométrie - Université de Lille, Sciences et Technologies - Université de Lille, Sciences Humaines et Sociales - PRES Université Lille Nord de France - Université de Lille, Droit et Santé, EPEE - Centre d'Etudes des Politiques Economiques - UEVE - Université d'Évry-Val-d'Essonne)

  • Thomas Seegmuller

    (CES - Centre d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique, PSE - Paris School of Economics - UP1 - Université Paris 1 Panthéon-Sorbonne - ENS-PSL - École normale supérieure - Paris - PSL - Université Paris Sciences et Lettres - EHESS - École des hautes études en sciences sociales - ENPC - École des Ponts ParisTech - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement)

Abstract

In his seminal contribution, Tirole (1985) shows that an overlapping generations economy may monotonically converges to a steady state with a positive rational bubble, characterized by the dynamically efficient golden rule. The issue we address is whether this monotonic convergence to an efficient long-run equilibrium may fail, while the economy experiences persistent endogenous fluctuations around the golden rule. Our explanation leads on the features of the credit market. We consider a simple overlapping generations model with three assets : money, capital and a pure bubble (bonds). Collateral matters because increasing his portfolio in capital and bubble, the household reduces the share of his consumption paid by cash. From a positive point of view, we show that the bubbly steady state can be locally indeterminate under arbitrarily small credit market imperfections and, thereby, persistent expectation-driven fluctuations of equilibria with (rational) bubbles can arise. From a normative point of view, monetary policies that are not too expansive, are recommended in order to rule out the occurence of sunspot fluctuations and enhance the welfare evaluated at the steady state.

Suggested Citation

  • Stefano Bosi & Thomas Seegmuller, 2009. "On Rational Exuberance," Post-Print halshs-00367689, HAL.
  • Handle: RePEc:hal:journl:halshs-00367689
    Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00367689
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    1. Azariadis, Costas & Reichlin, Pietro, 1996. "Increasing returns and crowding out," Journal of Economic Dynamics and Control, Elsevier, vol. 20(5), pages 847-877, May.
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    4. Michel, Philippe & Wigniolle, Bertrand, 2005. "Cash-In-Advance Constraints, Bubbles, And Monetary Policy," Macroeconomic Dynamics, Cambridge University Press, vol. 9(1), pages 28-56, February.
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    6. Crettez, Bertrand & Michel, Philippe & Wigniolle, Bertrand, 1999. "Cash-in-Advance Constraints in the Diamond Overlapping Generations Model: Neutrality and Optimality of Monetary Policies," Oxford Economic Papers, Oxford University Press, vol. 51(3), pages 431-452, July.
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    Cited by:

    1. Wigniolle, B., 2014. "Optimism, pessimism and financial bubbles," Journal of Economic Dynamics and Control, Elsevier, vol. 41(C), pages 188-208.
    2. Lise Clain-Chamosset-Yvrard & Thomas Seegmuller, 2013. "The Stabilizing Virtues of Fiscal vs. Monetary Policy on Endogenous Bubble Fluctuations," Working Papers halshs-00854536, HAL.
    3. Boucekkine, Raouf & Kazuo, Nishimura & Venditti, Alain, 2017. "Introduction to international financial markets and banking systems crises," Journal of Mathematical Economics, Elsevier, vol. 68(C), pages 87-91.
    4. Raurich, Xavier & Seegmuller, Thomas, 2019. "On the interplay between speculative bubbles and productive investment," European Economic Review, Elsevier, vol. 111(C), pages 400-420.
    5. Kowalski, Tadeusz, 2013. "Globalization and Transformation in Central European Countries: The Case of Poland," MPRA Paper 59306, University Library of Munich, Germany.
    6. Barbar, Riham & Bosi, Stefano, 2010. "Collaterals and macroeconomic volatility," Research in Economics, Elsevier, vol. 64(3), pages 146-161, September.
    7. Stefano Bosi & Thomas Seegmuller, 2013. "Rational bubbles and expectation-driven fluctuations," International Journal of Economic Theory, The International Society for Economic Theory, vol. 9(1), pages 69-83, March.
    8. Clain-Chamosset-Yvrard, Lise & Seegmuller, Thomas, 2015. "Rational bubbles and macroeconomic fluctuations: The (de-)stabilizing role of monetary policy," Mathematical Social Sciences, Elsevier, vol. 75(C), pages 1-15.

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    More about this item

    Keywords

    Bubbles; collaterals; overlapping generations; indeterminacy; cash-in-advance constraint; Bulles collatéral; indétermination; contrainte de liquidité; générations imbriquées;
    All these keywords.

    JEL classification:

    • D91 - Microeconomics - - Micro-Based Behavioral Economics - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making
    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • E50 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - General

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