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The Evolution of Cooperation: The Role of Costly Strategy Adjustments

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  • Julian Romero
  • Yaroslav Rosokha

Abstract

We study the evolution of cooperation in the indefinitely repeated prisoner's dilemma when it is costly for players to adjust their strategy. Our experimental interface allows subjects to design a comprehensive strategy that then selects actions for them in every period. We conduct lab experiments in which subjects can adjust their strategies during a repeated game but may incur a cost for doing so. We find three main results. First, subjects learn to cooperate more when adjustments are costless than when they are costly. Second, subjects make more adjustments to their strategies when adjustments are costless, but they still make adjustments even when they are costly. Finally, we find that cooperative strategies emerge over time when adjustments are costless but not when adjustments are costly. These results highlight that within-game experimentation is critical to the rise of cooperative behavior. We provide simulations based on an evolutionary algorithm to support these results.

Suggested Citation

  • Julian Romero & Yaroslav Rosokha, 2019. "The Evolution of Cooperation: The Role of Costly Strategy Adjustments," American Economic Journal: Microeconomics, American Economic Association, vol. 11(1), pages 299-328, February.
    • Handle: RePEc:aea:aejmic:v:11:y:2019:i:1:p:299-328
    Note: DOI: 10.1257/mic.20160220
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    Citations

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    Cited by:

    1. Collins, Sean M. & James, Duncan & Servátka, Maroš & Vadovič, Radovan, 2021. "Attainment of equilibrium via Marshallian path adjustment: Queueing and buyer determinism," Games and Economic Behavior, Elsevier, vol. 125(C), pages 94-106.
    2. Bigoni, Maria & Casari, Marco & Salvanti, Andrea & Skrzypacz, Andrzej & Spagnolo, Giancarlo, 2022. "It's Payback time: new insights on cooperation in the repeated prisoners' dilemma," CEPR Discussion Papers 16912, C.E.P.R. Discussion Papers.
    3. Roy Chen & Yan Chen & Yohanes E. Riyanto, 2021. "Best practices in replication: a case study of common information in coordination games," Experimental Economics, Springer;Economic Science Association, vol. 24(1), pages 2-30, March.
    4. Evans, Alecia & Sesmero, Juan, 2022. "Cooperation in Social Dilemmas with Correlated Noisy Payoffs: Theory and Experimental Evidence," 2021 Annual Meeting, August 1-3, Austin, Texas 322804, Agricultural and Applied Economics Association.
    5. Collins, Sean M. & James, Duncan & Servátka, Maroš & Vadovič, Radovan, 2020. "Attainment of Equilibrium: Marshallian Path Adjustment and Buyer Determinism," MPRA Paper 104103, University Library of Munich, Germany.
    6. Julian Romero & Yaroslav Rosokha, 2023. "Mixed Strategies in the Indefinitely Repeated Prisoner's Dilemma," Econometrica, Econometric Society, vol. 91(6), pages 2295-2331, November.
    7. Evans, Alecia & Sesmero, Juan Pablo, 2022. "Noisy Payoffs in an Infinitely Repeated Prisoner’s Dilemma – Experimental Evidence," 2022 Annual Meeting, July 31-August 2, Anaheim, California 322434, Agricultural and Applied Economics Association.
    8. Normann, Hans-Theo & Sternberg, Martin, 2022. "Human-algorithm interaction: Algorithmic pricing in hybrid laboratory markets," DICE Discussion Papers 392, Heinrich Heine University Düsseldorf, Düsseldorf Institute for Competition Economics (DICE).
    9. Normann, Hans-Theo & Sternberg, Martin, 2023. "Human-algorithm interaction: Algorithmic pricing in hybrid laboratory markets," European Economic Review, Elsevier, vol. 152(C).

    More about this item

    JEL classification:

    • C71 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Cooperative Games
    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior

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