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Application of the discrete separation theorem to auctions

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  • Yokote, Koji

Abstract

The separation theorem in discrete convex analysis states that two disjoint discrete convex sets can be separated by a hyperplane with a 0-1 normal vector. We apply this theorem to an auction model and provide a unified approach to existing results. When p is not an equilibrium price vector, i.e., aggregate demand and aggregate supply are disjoint, the separation theorem indicates the existence of excess demand/supply. This observation yields a refined analysis of a characterization of competitive price vectors by Gul and Stacchetti (2000). Adjusting the prices of items in excess demand/supply corresponds to Ausubel's (2006) auction.

Suggested Citation

  • Yokote, Koji, 2017. "Application of the discrete separation theorem to auctions," MPRA Paper 82884, University Library of Munich, Germany.
    • Handle: RePEc:pra:mprapa:82884
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    File URL: https://mpra.ub.uni-muenchen.de/82884/1/MPRA_paper_82884.pdf
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    References listed on IDEAS

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    1. Kazuo Murota, 2016. "Discrete convex analysis: A tool for economics and game theory," The Journal of Mechanism and Institution Design, Society for the Promotion of Mechanism and Institution Design, University of York, vol. 1(1), pages 151-273, December.
    2. Demange, Gabrielle & Gale, David & Sotomayor, Marilda, 1986. "Multi-Item Auctions," Journal of Political Economy, University of Chicago Press, vol. 94(4), pages 863-872, August.
    3. Mishra, Debasis & Talman, Dolf, 2010. "Characterization of the Walrasian equilibria of the assignment model," Journal of Mathematical Economics, Elsevier, vol. 46(1), pages 6-20, January.
    4. Kelso, Alexander S, Jr & Crawford, Vincent P, 1982. "Job Matching, Coalition Formation, and Gross Substitutes," Econometrica, Econometric Society, vol. 50(6), pages 1483-1504, November.
    5. Gul, Faruk & Stacchetti, Ennio, 2000. "The English Auction with Differentiated Commodities," Journal of Economic Theory, Elsevier, vol. 92(1), pages 66-95, May.
    6. Lawrence M. Ausubel, 2006. "An Efficient Dynamic Auction for Heterogeneous Commodities," American Economic Review, American Economic Association, vol. 96(3), pages 602-629, June.
    7. Satoru Fujishige & Zaifu Yang, 2003. "A Note on Kelso and Crawford's Gross Substitutes Condition," Mathematics of Operations Research, INFORMS, vol. 28(3), pages 463-469, August.
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    More about this item

    Keywords

    Discrete convex analysis; Separation theorem; Hall's theorem; Auction;
    All these keywords.

    JEL classification:

    • C78 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Bargaining Theory; Matching Theory
    • D44 - Microeconomics - - Market Structure, Pricing, and Design - - - Auctions

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