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Do buyer groups facilitate collusion?

Author

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  • Normann, Hans-Theo
  • Rösch, Jürgen
  • Schultz, Luis Manuel
Abstract
We explore whether lawful cooperation in buyer groups facilitates collusion in the product market. Buyer groups purchase inputs more economically. In a repeated game, abandoning the buyer group altogether or excluding single firms constitute credible threats. Hence, in theory, buyer groups facilitate collusion. We run several experimental treatments using three-firm Cournot markets to test these predictions and other effects like how buyer groups affect outcomes when group members can communicate. The experimental results show that buyer groups lead to lower outputs when groups can exclude single firms. Communication is often abused for explicit agreements and this strongly reduces competition.

Suggested Citation

  • Normann, Hans-Theo & Rösch, Jürgen & Schultz, Luis Manuel, 2015. "Do buyer groups facilitate collusion?," Journal of Economic Behavior & Organization, Elsevier, vol. 109(C), pages 72-84.
    • Handle: RePEc:eee:jeborg:v:109:y:2015:i:c:p:72-84
    DOI: 10.1016/j.jebo.2014.11.004
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    2. Peter T. Dijkstra & Marco A. Haan & Lambert Schoonbeek, 2021. "Leniency Programs and the Design of Antitrust: Experimental Evidence with Free-Form Communication," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 59(1), pages 13-36, August.
    3. Marie-Laure Allain & Rémi Avignon & Claire Chambolle & Hugo Molina, 2022. "Buying groups formation: what effects on competition in the retail industry? [Les centrales d’achat : quels enjeux de concurrence ?]," Working Papers halshs-03693375, HAL.
    4. Marie-Laure Allain & Rémi Avignon & Claire Chambolle & Hugo Molina, 2022. "Buying groups formation: what effects on competition in the retail industry? [Formation des groupements d'achat : quels effets sur la concurrence dans le commerce de détail ?]," Working Papers halshs-03693440, HAL.
    5. Barreda-Tarrazona, Iván & García-Gallego, Aurora & Georgantzís, Nikolaos & Ziros, Nicholas, 2018. "Market games as social dilemmas," Journal of Economic Behavior & Organization, Elsevier, vol. 155(C), pages 435-444.
    6. Krämer Jan & Vogelsang Ingo, 2016. "Co-Investments and Tacit Collusion in Regulated Network Industries: Experimental Evidence," Review of Network Economics, De Gruyter, vol. 15(1), pages 35-61, March.
    7. Gomez-Martinez, Francisco & Onderstal, Sander & Sonnemans, Joep, 2016. "Firm-specific information and explicit collusion in experimental oligopolies," European Economic Review, Elsevier, vol. 82(C), pages 132-141.
    8. Miguel A. Fonseca & Yan Li & Hans‐Theo Normann, 2018. "Why factors facilitating collusion may not predict cartel occurrence — experimental evidence," Southern Economic Journal, John Wiley & Sons, vol. 85(1), pages 255-275, July.
    9. Liesbeth Colen & Zohra Bouamra-Mechemache & Victoria Daskalova & Kjersti Nes, 2020. "Retail alliances in the agricultural and food supply chain," JRC Research Reports JRC120271, Joint Research Centre.
    10. Waichman, Israel & Blanckenburg, Korbinian von, 2020. "Is there no “I” in “Team”? Interindividual-intergroup discontinuity effect in a Cournot competition experiment," Journal of Economic Psychology, Elsevier, vol. 77(C).

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    More about this item

    Keywords

    Buyer groups; Cartels; Collusion; Communication; Experiments; Repeated games;
    All these keywords.

    JEL classification:

    • C7 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory
    • C9 - Mathematical and Quantitative Methods - - Design of Experiments
    • L4 - Industrial Organization - - Antitrust Issues and Policies
    • L41 - Industrial Organization - - Antitrust Issues and Policies - - - Monopolization; Horizontal Anticompetitive Practices

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