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Using methods from evolutionary game theory, this paper investigates thedifference between social cohesion and task cohesion in promoting the evolutionof cooperation in group interactions. Players engage in public goods games andare allowed to leave their groups if too many defections occur. Both socialcohesion and task cohesion may prevent players from leaving. While a higherlevel of social cohesion increases a player's tolerance towards defections,task cohesion is associated with her group performance in the past. With ahigher level of task cohesion, it is more likely that a dissatisfied playerwill refer to the history and remains in her group if she was satisfied in thepast. Our results reveal that social cohesion is detrimental to the evolutionof cooperation while task cohesion facilitates it. This is because socialcohesion hinders the conditional dissociation mechanism but task cohesionimproves the robustness of cooperative groups which are usually vulnerable tomistakes. We also discuss other potential aspects of cohesion and how they canbe investigated through our modelling. Overall, our analysis provides novelinsights into the relationship between group cohesion and group performancethrough studying the group dynamics and suggests further application ofevolutionary game theory in this area.

Social cohesion V.S. task cohesion: An evolutionary game theory study