# 09-109/1 (2009-11-30)

Maarten Janssen, University of Vienna, and Erasmus University Rotterdam; Vladimir A. Karamychev; Emiel Maasland, Erasmus School of Economics, Erasmus University Rotterdam
auctions, efficiency, entry fee, negative externality, revenue
JEL codes:
C72, D44

This discussion paper led to an article in Games and Economic Behavior (2011). Vol. 72, pp. 594-601.

There is by now a large literature arguing that auctions with a variety of after-market interactions may not yield an efficient allocation of the objects for sale, especially when the bidders impose strong negative externalities upon each other. This paper argues that these inefficiencies can be avoided by asking bidders prior to the auction to submit any public payment they would like to make. These payments, so-called flexible entry fees, do not affect the allocation decision of the auctioneer. We show that auctions with flexible entry fees have a fully revealing equilibrium where bidders signal their type before the auction itself takes place.