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

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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. repec:eee:ecolet:v:161:y:2017:i:c:p:71-73 is not listed on IDEAS
    2. Rudolf Kerschbamer & Daniel Muller, 2017. "Social preferences and political attitudes: An online experiment on a large heterogeneous sample," Working Papers 2017-16, Faculty of Economics and Statistics, University of Innsbruck.

    More about this item

    Keywords

    Second-price auction; spite; overbidding; laboratory experiments;

    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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