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The 'Shill Bidding Effect' Versus the 'Linkage Principle'

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  • Laurent Lamy

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Abstract

The analysis of second price auctions with externalities is utterly modified if the seller is unable to commit not to participate in the mechanism. For the General Symmetric Model introduced by Milgrom and Weber [P. Milgrom, R. Weber, A theory of auctions and competitive bidding, Econometrica 50 (1982) 1089–1122] we characterize the full set of separating equilibria that are symmetric among buyers and with a strategic seller being able to bid in the same way as any buyer through a so-called shill bidding activity. The revenue ranking between first and second price auctions is different from the one arising in Milgrom and Weber: the benefits from the highlighted ‘Linkage Principle’ are counterbalanced by the ‘Shill Bidding Effect.’

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  • Laurent Lamy, 2005. "The 'Shill Bidding Effect' Versus the 'Linkage Principle'," Working Papers 2005-35, Center for Research in Economics and Statistics.
    • Handle: RePEc:crs:wpaper:2005-35
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    Cited by:

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    3. Bose, Subir & Daripa, Arup, 2017. "Shills and snipes," Games and Economic Behavior, Elsevier, vol. 104(C), pages 507-516.
    4. McCannon, Bryan C. & Minuci, Eduardo, 2020. "Shill bidding and trust," Journal of Behavioral and Experimental Finance, Elsevier, vol. 26(C).
    5. Lorentziadis, Panos L., 2016. "Optimal bidding in auctions from a game theory perspective," European Journal of Operational Research, Elsevier, vol. 248(2), pages 347-371.
    6. Philippe Jehiel & Laurent Lamy, 2015. "On absolute auctions and secret reserve prices," RAND Journal of Economics, RAND Corporation, vol. 46(2), pages 241-270, June.
    7. Mohammad Akbarpour & Shengwu Li, 2020. "Credible Auctions: A Trilemma," Econometrica, Econometric Society, vol. 88(2), pages 425-467, March.
    8. Philippe Jehiel & Laurent Lamy, 2011. "Absolute auctions and secret reserve prices: Why are they used?," Levine's Working Paper Archive 786969000000000316, David K. Levine.
    9. Onur A. Koska & Ilke Onur & Frank Stähler, 2017. "The Economics of Vendor Bids," ERC Working Papers 1711, ERC - Economic Research Center, Middle East Technical University, revised Oct 2017.
    10. Nikitkov, Alexey & Bay, Darlene, 2015. "Shill bidding: Empirical evidence of its effectiveness and likelihood of detection in online auction systems," International Journal of Accounting Information Systems, Elsevier, vol. 16(C), pages 42-54.
    11. Ingebretsen Carlson, Jim & Wu, Tingting, 2022. "Shill bidding and information in eBay auctions: A Laboratory study," Journal of Economic Behavior & Organization, Elsevier, vol. 202(C), pages 341-360.

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