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Contribution Details

Type Working Paper
Scope Discipline-based scholarship
Title An externality-robust auction - theory and experimental evidence
Organization Unit
  • Nick Netzer
  • Björn Bartling
  • English
Institution University of Zurich
Series Name SSRN
Number 2359529
ISSN 1556-5068
Date 2013
Abstract Text An auction is said to be externality-robust if unilateral deviations from equilibrium leave the remaining bidders’ payoffs unaffected. The equilibrium and its outcome will then persist even if externalities between bidders arise from certain types of interdependent preferences. One important example are externalities due to spiteful preferences, which are frequently used to explain overbidding in auctions. Another important example are cross-shareholdings between firms that compete in an auction. For the independent private values model, we derive an auction that coincides with the second-price auction (SPA) in terms of efficiency and expected revenue, and, in contrast to the second-price auction, is also externality-robust. The externality-robust auction (ERA) is a first-price auction in which truthful bidding is encouraged by bonus payments. We test the robustness property experimentally by comparing the outcomes of the SPA and the ERA. We replicate the earlier finding of significant average overbidding in the SPA, while we find no overbidding on average in the ERA. We also conduct additional treatments where bidders play against the computer, and we use controls for cognitive skills and joy of winning to further pin down the reasons behind the subjects’ bidding behavior and to understand the sources of individual heterogeneity.
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Digital Object Identifier 10.2139/ssrn.2359529
Other Identification Number merlin-id:8854
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