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The B.E. Journal of Economic Analysis & Policy

Editor-in-Chief: Jürges, Hendrik / Ludwig, Sandra

Ed. by Auriol , Emmanuelle / Brunner, Johann / Fleck, Robert / Friebel, Guido / Mendola, Mariapia / Requate, Till / Tsui, Kevin / Wichardt, Philipp / Zulehner, Christine

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Separating Equilibria in Public Auctions

Arieh Gavious1

1Ben Gurion University,

Citation Information: The B.E. Journal of Economic Analysis & Policy. Volume 9, Issue 1, ISSN (Online) 1935-1682, DOI: 10.2202/1935-1682.2183, September 2009

Publication History

Published Online:
2009-09-03

Abstract

We consider two private-value auctions where the prize in one is higher than the prize in the other. We show that a separating equilibrium exists in which bidders with a high valuation attend the auction with the higher prize while bidders with a low valuation attend the auction with the lower prize. In addition, we prove that a weak separating equilibrium exists where the strong bidders attend the high prize auction while the weak bidders randomize and may attend either auction, although with a higher probability of attending the low prize auction. In the set of auctions with separating equilibrium, we find the optimal minimum bids that maximize a seller's expected revenue.

Keywords: auctions; separating equilibrium; selling mechanisms; private information

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