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Pure numbers effects, market power, and tacit collusion in posted offer markets

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  • Davis, Douglas

Abstract

This paper studies the effects of seller concentration and static market power on tacit collusion in extensively repeated laboratory posted-offer markets. Contrary to the implications of some earlier research, we find that tacit collusion does not become pervasive with extensive repetition. In a 'strong no-power' design persistently competitive outcomes are observed in markets with three or four sellers. Even duopolies are frequently competitive in this design. Unilateral market power raises prices, as predicted. However, static Nash predictions fail to organize outcomes across power treatments, because tacit collusion moves inversely with concentration. Excess capacity appears to explain observed tacit collusion levels.

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  • Davis, Douglas, 2009. "Pure numbers effects, market power, and tacit collusion in posted offer markets," Journal of Economic Behavior & Organization, Elsevier, vol. 72(1), pages 475-488, October.
    • Handle: RePEc:eee:jeborg:v:72:y:2009:i:1:p:475-488
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    Cited by:

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    2. Kephart, Curtis & Munro, David, 2023. "Market concentration and the responsiveness of prices and mark-ups," Journal of Behavioral and Experimental Economics (formerly The Journal of Socio-Economics), Elsevier, vol. 104(C).
    3. Douglas Davis & Oleg Korenok & Robert Reilly, 2009. "Re-matching, information and sequencing effects in posted offer markets," Experimental Economics, Springer;Economic Science Association, vol. 12(1), pages 65-86, March.
    4. Andrei Y. Shastitko & Svetlana V. Golovanova, 2014. "Collusion in markets characterized by one large buyer: lessons learned from an antitrust case in Russia," HSE Working papers WP BRP 49/EC/2014, National Research University Higher School of Economics.
    5. Jan Potters & Sigrid Suetens, 2013. "Oligopoly Experiments In The Current Millennium," Journal of Economic Surveys, Wiley Blackwell, vol. 27(3), pages 439-460, July.
    6. Bulutay, Muhammed & Hales, David & Julius, Patrick & Tasch, Weiwei, 2021. "Imperfect tacit collusion and asymmetric price transmission," Journal of Economic Behavior & Organization, Elsevier, vol. 192(C), pages 584-599.
    7. Nobuyuki Hanaki & Aidas Masiliunas, 2021. "Market Concentration and Incentives to Collude in Cournot Oligopoly Experiments," ISER Discussion Paper 1131, Institute of Social and Economic Research, Osaka University.

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    More about this item

    Keywords

    Experiments Market concentration Market power;

    JEL classification:

    • C9 - Mathematical and Quantitative Methods - - Design of Experiments
    • D4 - Microeconomics - - Market Structure, Pricing, and Design
    • L4 - Industrial Organization - - Antitrust Issues and Policies

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