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A Complete Characterization of Pure Strategy Equilibrium in Uniform Price IPO Auctions


  • Ping Zhang

    () (University of Nottingham)


Collusive equilibria in share auctions despite being the focus of previous theoretical research, have received little empirical or experimental support. We develop a theoretical model of uniform price initial public offering (IPO) auctions and show that there exists a continuum of pure strategy equilibria where investors with a higher expected valuation bid more aggressively and as a result the market price increases with the market value. The collusive equilibria lie in fact on the boundary of this set, which is obtained under stricter conditions when demand is discrete than in the continuous format. Our results have important implications for the design of IPO auctions.

Suggested Citation

  • Ping Zhang, 2006. "A Complete Characterization of Pure Strategy Equilibrium in Uniform Price IPO Auctions," Discussion Papers 2006-06, The Centre for Decision Research and Experimental Economics, School of Economics, University of Nottingham.
  • Handle: RePEc:not:notcdx:2006-06

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    References listed on IDEAS

    1. Richard Engelbrecht-Wiggans & John A. List & David H. Reiley, 2006. "Demand Reduction In Multi-Unit Auctions With Varying Numbers Of Bidders: Theory And Evidence From A Field Experiment ," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 47(1), pages 203-231, February.
    2. Orly Sade & Charles Schnitzlein & Jaime Zender, 2006. "Competition and cooperation in divisible good auctions: An experimental examination," Artefactual Field Experiments 00105, The Field Experiments Website.
    3. Orly Sade & Charles Schnitzlein & Jaime F. Zender, 2006. "Competition and Cooperation in Divisible Good Auctions: An Experimental Examination," Review of Financial Studies, Society for Financial Studies, vol. 19(1), pages 195-235.
    4. Tenorio, Rafael, 1993. "Revenue Equivalence and Bidding Behavior in a Multi-unit Auction Market: An Empirical Analysis," The Review of Economics and Statistics, MIT Press, vol. 75(2), pages 302-314, May.
    5. Umlauf, Steven R., 1993. "An empirical study of the Mexican Treasury bill auction," Journal of Financial Economics, Elsevier, vol. 33(3), pages 313-340, June.
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    More about this item


    IPO; uniform price auction; divisible goods; share auctions; tacit collusion;

    JEL classification:

    • D44 - Microeconomics - - Market Structure, Pricing, and Design - - - Auctions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design


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