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Does the absence of human sellers bias bidding behavior in auction experiments?

Author

Listed:
  • Björn Bartling
  • Tobias Gesche
  • Nick Netzer

Abstract

This paper studies the impact of the presence of human subjects in the role of a seller on bidding in experimental second-price auctions. Overbidding is a robust finding in second- price auctions, and spite among bidders has been advanced as an explanation. If spite extends to the seller, then the absence of human sellers who receive the auction revenue may bias upwards the bidding behavior in existing experimental auctions. We derive the equilibrium bidding function in a model where bidders have preferences regarding both, the payoffs of other bidders and the seller’s revenue. Overbidding is optimal when buyers are spiteful only towards other buyers. However, optimal bids are lower and potentially even truthful when spite extends to the seller. We experimentally test the model predictions by exogenously varying the presence of human subjects in the roles of the seller and competing bidders. We do not detect a systematic effect of the presence of a human seller on overbidding. We conclude that overbidding is not an artefact of the standard experimental implementation of second-price auctions in which human sellers are absent.

Suggested Citation

  • Björn Bartling & Tobias Gesche & Nick Netzer, 2016. "Does the absence of human sellers bias bidding behavior in auction experiments?," ECON - Working Papers 225, Department of Economics - University of Zurich.
    • Handle: RePEc:zur:econwp:225
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    References listed on IDEAS

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    Cited by:

    1. Wladislaw Mill & Jonathan Stäbler, 2023. "Spite in Litigation," CESifo Working Paper Series 10290, CESifo.
    2. Oliver Kirchkamp & Wladislaw Mill, 2019. "Spite vs. risk: explaining overbidding," CESifo Working Paper Series 7631, CESifo.
    3. Ahrash Dianat & Mikhail Freer, 2021. "Credibility in Second-Price Auctions: An Experimental Test," Papers 2105.00204, arXiv.org, revised Jan 2023.
    4. Theo Offerman & Giorgia Romagnoli & Andreas Ziegler, 2022. "Why are open ascending auctions popular? The role of information aggregation and behavioral biases," Quantitative Economics, Econometric Society, vol. 13(2), pages 787-823, May.
    5. Kerschbamer, Rudolf & Müller, Daniel, 2020. "Social preferences and political attitudes: An online experiment on a large heterogeneous sample," Journal of Public Economics, Elsevier, vol. 182(C).
    6. Kirchkamp, Oliver & Mill, Wladislaw, 2021. "Spite vs. risk: Explaining overbidding in the second-price all-pay auction," Games and Economic Behavior, Elsevier, vol. 130(C), pages 616-635.
    7. Mill, Wladislaw, 2017. "The spite motive in third price auctions," Economics Letters, Elsevier, vol. 161(C), pages 71-73.
    8. Mill, Wladislaw & Morgan, John, 2022. "Competition between friends and foes," European Economic Review, Elsevier, vol. 147(C).

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    More about this item

    Keywords

    Second-price auction; spite; overbidding; laboratory experiments;
    All these keywords.

    JEL classification:

    • C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior
    • D03 - Microeconomics - - General - - - Behavioral Microeconomics: Underlying Principles
    • D44 - Microeconomics - - Market Structure, Pricing, and Design - - - Auctions
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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