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Arbitrage, duality and asset equilibria

  • Dana, Rose-Anne
  • Le Van, Cuong

In finite dimensional economies, it was proven by Werner [Werner, J., 1987. Arbitrage and the existence of competitive equilibrium. Econometrica 55, 1403–1418.], that if there exists a no-arbitrage price (equivalently, under standard assumptions on agents' utilities, if aggregate demand exists for some price), then there exists an equilibrium. This result does not generalize to the infinite dimension. The purpose of this paper is to propose a “utility weight” interpretation of the notion of “of no-arbitrage price”. We define “fair utility weight vectors” as utility weight vectors for which the representative agent problem has a unique solution. They correspond to no-arbitrage prices. The assumption that there exists a Pareto-optimum, can be viewed as the equivalent of the assumption of existence of aggregate demand. We may then define in the space of utility weight vector, the excess utility correspondence, which has the properties of an excess demand correspondence. We use a generalized version of Gale–Nikaido–Debreu's lemma to prove the existence of an equilibrium.

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Paper provided by CEPREMAP in its series CEPREMAP Working Papers (Couverture Orange) with number 9613.

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Length: 22 pages
Date of creation: 1996
Date of revision:
Handle: RePEc:cpm:cepmap:9613
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  1. Brown, Donald J & Werner, Jan, 1995. "Arbitrage and Existence of Equilibrium in Infinite Asset Markets," Review of Economic Studies, Wiley Blackwell, vol. 62(1), pages 101-14, January.
  2. Dana, Rose-Anne & Le Van, Cuong & Magnien, Francois, 1999. "On the Different Notions of Arbitrage and Existence of Equilibrium," Journal of Economic Theory, Elsevier, vol. 87(1), pages 169-193, July.
  3. Green, Jerry R, 1973. "Temporary General Equilibrium in a Sequential Trading Model with Spot and Futures Transactions," Econometrica, Econometric Society, vol. 41(6), pages 1103-23, November.
  4. Chichilnisky Graciela & Heal Geoffrey M., 1993. "Competitive Equilibrium in Sobolev Spaces without Bounds on Short Sales," Journal of Economic Theory, Elsevier, vol. 59(2), pages 364-384, April.
  5. Monique Florenzano, 2007. "General equilibrium," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00250167, HAL.
  6. Werner, Jan, 1987. "Arbitrage and the Existence of Competitive Equilibrium," Econometrica, Econometric Society, vol. 55(6), pages 1403-18, November.
  7. Page Jr., Frank H. & Wooders, Myrna Holtz, 1996. "A necessary and sufficient condition for the compactness of individually rational and feasible outcomes and the existence of an equilibrium," Economics Letters, Elsevier, vol. 52(2), pages 153-162, August.
  8. Hart, Oliver D., 1974. "On the existence of equilibrium in a securities model," Journal of Economic Theory, Elsevier, vol. 9(3), pages 293-311, November.
  9. Grandmont, Jean-Michel, 1977. "Temporary General Equilibrium Theory," Econometrica, Econometric Society, vol. 45(3), pages 535-72, April.
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