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An experimental Nash program: A comparison of structured versus semi-structured bargaining experiments

Author

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  • Michela Chessa

    (GREDEG - Groupe de Recherche en Droit, Economie et Gestion - UNS - Université Nice Sophia Antipolis (1965 - 2019) - CNRS - Centre National de la Recherche Scientifique - UniCA - Université Côte d'Azur)

  • Nobuyuki Hanaki

    (Osaka University [Osaka])

  • Aymeric Lardon

    (GATE Lyon Saint-Étienne - Groupe d'Analyse et de Théorie Economique Lyon - Saint-Etienne - UL2 - Université Lumière - Lyon 2 - UJM - Université Jean Monnet - Saint-Étienne - EM - EMLyon Business School - CNRS - Centre National de la Recherche Scientifique)

  • Takashi Yamada

    (Yamaguchi University [Yamaguchi])

Abstract

While market design advocates for the importance of good design to achieve desirable properties, experiments on coalition formation theory have shown fragility in proposed mechanisms to do so. We experimentally investigate the effectiveness of "structured" mechanisms that implement the Shapley value as an ex ante equilibrium outcome with those of corresponding "semi-structured" bargaining procedures. We find a significantly higher frequency of grand coalition formation and higher efficiency in the semi-structured than in the structured procedures regardless of whether they are demand-based or offer-based. While significant differences in the resulting allocations are observed between the two structured procedures, little difference is observed between the two semi-structured procedures. Finally, the possibility of free-form chat induces an equal division more frequently than occurs without it. Our results suggest that when it comes to bargaining and coalition formation, not having various restrictions imposed by different mechanisms may lead to more desirable outcomes.

Suggested Citation

  • Michela Chessa & Nobuyuki Hanaki & Aymeric Lardon & Takashi Yamada, 2025. "An experimental Nash program: A comparison of structured versus semi-structured bargaining experiments," Post-Print hal-05441314, HAL.
    • Handle: RePEc:hal:journl:hal-05441314
    DOI: 10.1017/eec.2025.10032
    Note: View the original document on HAL open archive server: https://hal.science/hal-05441314v1
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