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Pareto-efficiency and endogenous fertility: a simple model


  • Philippe Michel

    (GREQAM - Groupement de Recherche en Économie Quantitative d'Aix-Marseille - ECM - Ecole Centrale de Marseille - CNRS - Centre National de la Recherche Scientifique - AMU - Aix Marseille Université - EHESS - École des hautes études en sciences sociales)

  • Bertrand Wigniolle

    () (CES - Centre d'économie de la Sorbonne - UP1 - Université Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique, PSE - Paris School of Economics)


This article is devoted to the study of the Pareto-efficiency of the competitive equilibrium for a simple overlapping generations economy with endogenous fertility. For CES utility and production functions, it is proved that the economic properties of the economy are closely related to the two elasticitiesof substitution. First, the competitive equilibrium exists and is unique if the sum of the two elasticities is not smaller than one. Secondly, a set of parameters is provided such that the equilibrium is both in under-accumulation and inefficient. Thirdly, a sufficient condition is proved that ensures that an equilibrium converging in under-accumulation is Pareto-efficient: the sum of the two elasticities must not be greater than two.

Suggested Citation

  • Philippe Michel & Bertrand Wigniolle, 2009. "Pareto-efficiency and endogenous fertility: a simple model," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00306463, HAL.
  • Handle: RePEc:hal:cesptp:halshs-00306463
    DOI: 10.1080/08898480802619587
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    References listed on IDEAS

    1. Michel, Philippe & Pestieau, P, 1993. "Population Growth and Optimality: When Does Serendipity Hold?," Journal of Population Economics, Springer;European Society for Population Economics, vol. 6(4), pages 353-362, November.
    2. Mikhail Golosov & Larry E. Jones & Michèle Tertilt, 2007. "Efficiency with Endogenous Population Growth," Econometrica, Econometric Society, vol. 75(4), pages 1039-1071, July.
    3. Jeremy Greenwood & Ananth Seshadri & Guillaume Vandenbroucke, 2005. "The Baby Boom and Baby Bust," American Economic Review, American Economic Association, vol. 95(1), pages 183-207, March.
    4. Birdsall, Nancy, 1988. "Economic approaches to population growth," Handbook of Development Economics,in: Hollis Chenery & T.N. Srinivasan (ed.), Handbook of Development Economics, edition 1, volume 1, chapter 12, pages 477-542 Elsevier.
    5. Willis, Robert J, 1973. "A New Approach to the Economic Theory of Fertility Behavior," Journal of Political Economy, University of Chicago Press, vol. 81(2), pages 14-64, Part II, .
    6. Philippe Michel & Bertrand Wigniolle, 2007. "On Efficient Child Making," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 31(2), pages 307-326, May.
    7. W. A. Brock, 1970. "On Existence of Weakly Maximal Programmes in a Multi-Sector Economy," Review of Economic Studies, Oxford University Press, vol. 37(2), pages 275-280.
    8. J. Ignacio Conde-Ruiz & Eduardo L. Giménez & Mikel Pérez-Nievas, 2010. "Millian Efficiency with Endogenous Fertility," Review of Economic Studies, Oxford University Press, vol. 77(1), pages 154-187.
    9. Eckstein, Zvi & Wolpin, Kenneth I., 1985. "Endogenous fertility and optimal population size," Journal of Public Economics, Elsevier, vol. 27(1), pages 93-106, June.
    10. Razin, Assaf & Ben-Zion, Uri, 1975. "An Intergenerational Model of Population Growth," American Economic Review, American Economic Association, vol. 65(5), pages 923-933, December.
    11. de la Croix,David & Michel,Philippe, 2002. "A Theory of Economic Growth," Cambridge Books, Cambridge University Press, number 9780521001151, May.
    12. Gary S. Becker, 1960. "An Economic Analysis of Fertility," NBER Chapters,in: Demographic and Economic Change in Developed Countries, pages 209-240 National Bureau of Economic Research, Inc.
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    Cited by:

    1. Thomas Baudin, 2012. "The Optimal Trade-Off Between Quality and Quantity with Unknown Number of Survivors," Mathematical Population Studies, Taylor & Francis Journals, vol. 19(2), pages 94-113, April.
    2. Schoonbroodt, Alice & Tertilt, Michèle, 2014. "Property rights and efficiency in OLG models with endogenous fertility," Journal of Economic Theory, Elsevier, vol. 150(C), pages 551-582.

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    endogenous fertility; Pareto-efficiency;


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