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Robustness of the Uniqueness of Walrasian Equilibrium with Cobb-Douglas Utilities


Author Info

  • David Cass

    (Department of Economics, University of Pennsylvania)

  • Abhinash Borah

    (Department of Economics, University of Pennsylvania)

  • Kyungmin Kim

    (Department of Economics, University of Pennsylvania)

  • Maxym Kryshko

    (Department of Economics, University of Pennsylvania)

  • Antonio Penta

    (Department of Economics, University of Pennsylvania)

  • Jonathan Pogach

    (Department of Economics, University of Pennsylvania)


The majority of results in the literature on general equilibrium are not for an economy (i.e. given an endowment and preferences), but rather, for a set of economies (i.e. a set of endowments given preferences). Therefore, we argue that the most appropriate robustness result requires perturbing economies uniformly over the space of endowments for which the result is obtained. In this paper, we examine the robustness of the uniqueness of Walrasian endowment economies with Cobb-Douglas utility functions under this interpretation of robustness. Namely, we prove that for economies described by Cobb-Douglas utilities and all endowments in a fixed set, uniqueness of equilibrium is robust to perturbations of the utility functions.

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Bibliographic Info

Paper provided by Penn Institute for Economic Research, Department of Economics, University of Pennsylvania in its series PIER Working Paper Archive with number 09-038.

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Length: 9 pages
Date of creation: 30 Oct 2009
Date of revision:
Handle: RePEc:pen:papers:09-038

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Keywords: Walrasian Equilibrium; Uniqueness; Robustness;

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  1. Allen, Beth, 1981. "Utility perturbations and the equilibrium price set," Journal of Mathematical Economics, Elsevier, vol. 8(3), pages 277-307, October.
  2. Smale, S., 1974. "Global analysis and economics IIA : Extension of a theorem of Debreu," Journal of Mathematical Economics, Elsevier, vol. 1(1), pages 1-14, March.
  3. Balasko, Yves, 1975. "Some results on uniqueness and on stability of equilibrium in general equilibrium theory," Journal of Mathematical Economics, Elsevier, vol. 2(2), pages 95-118.
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