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Community Structure and Market Outcomes: A Repeated Games-in-Networks Approach

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  • Itay P. Fainmesser
Abstract
Consider a large market with asymmetric information, in which sellers have the option to "cheat" their buyers, and buyers decide whether to repurchase from different sellers. We model active trade relationships as links in a buyer-seller network and study repeated games in such networks. Endowing sellers with incomplete knowledge of the network, we derive conditions that determine whether a network is consistent with cooperation between every buyer and seller that are connected. Three network features reduce the minimal discount factor sufficient for cooperation: moderate and balanced competition, sparseness, and segregation. Incentive constraints are binding and rule out efficient networks. (JEL C73, D82, D85, Z13)

Suggested Citation

  • Itay P. Fainmesser, 2012. "Community Structure and Market Outcomes: A Repeated Games-in-Networks Approach," American Economic Journal: Microeconomics, American Economic Association, vol. 4(1), pages 32-69, February.
    • Handle: RePEc:aea:aejmic:v:4:y:2012:i:1:p:32-69
    Note: DOI: 10.1257/mic.4.1.32
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    Cited by:

    1. Francesco Nava & Michele Piccione, 2011. "Efficiency in Repeated Two-Action Games with Local Monitoring," STICERD - Theoretical Economics Paper Series 560, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE.
    2. Carmona, Guilherme & Carvalho, Luís, 2016. "Repeated two-person zero-sum games with unequal discounting and private monitoring," Journal of Mathematical Economics, Elsevier, vol. 63(C), pages 131-138.
    3. Nava, Francesco & Piccione, Michele, 2011. "Efficiency in repeated two-action games with local monitoring," LSE Research Online Documents on Economics 58062, London School of Economics and Political Science, LSE Library.
    4. Jackson, Matthew O. & Zenou, Yves, 2015. "Games on Networks," Handbook of Game Theory with Economic Applications,, Elsevier.
    5. Fainmesser, Itay P., 2013. "Social networks and unraveling in labor markets," Journal of Economic Theory, Elsevier, vol. 148(1), pages 64-103.
    6. Alison Watts, 2016. "Auctions Versus Private Negotiations in Buyer-Seller Networks," Games, MDPI, vol. 7(3), pages 1-14, August.
    7. Fainmesser, Itay P., 2019. "Exclusive intermediation in unobservable networks," Games and Economic Behavior, Elsevier, vol. 113(C), pages 533-548.
    8. Itay Fainmesser, 2014. "Exclusive Intermediation," Working Papers 2014-3, Brown University, Department of Economics.
    9. Nava, Francesco & Piccione, Michele, 2012. "Efficiency in repeated games with local interaction and uncertain local monitoring," LSE Research Online Documents on Economics 54250, London School of Economics and Political Science, LSE Library.
    10. Fainmesser, Itay P. & Goldberg, David A., 2018. "Cooperation in partly observable networked markets," Games and Economic Behavior, Elsevier, vol. 107(C), pages 220-237.
    11. Balmaceda, Felipe & Escobar, Juan F., 2017. "Trust in cohesive communities," Journal of Economic Theory, Elsevier, vol. 170(C), pages 289-318.
    12. Arun G. Chandrasekhar & Cynthia Kinnan & Horacio Larreguy, 2018. "Social Networks as Contract Enforcement: Evidence from a Lab Experiment in the Field," American Economic Journal: Applied Economics, American Economic Association, vol. 10(4), pages 43-78, October.
    13. , & ,, 2014. "Efficiency in repeated games with local interaction and uncertain local monitoring," Theoretical Economics, Econometric Society, vol. 9(1), January.
    14. Itay P. Fainmesser & David A. Goldberg, 2011. "Bilateral and Community Enforcement in a Networked Market with Simple Strategies," Working Papers 2011-2, Brown University, Department of Economics.

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    More about this item

    JEL classification:

    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
    • Z13 - Other Special Topics - - Cultural Economics - - - Economic Sociology; Economic Anthropology; Language; Social and Economic Stratification

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