Working Paper Series

Eva Ranehill, Frédéric Schneider and Roberto A. Weber (2013), Working paper series / Department of Economics No. 103

Growing Groups, Cooperation, and the Rate of Entry


We study the stability of voluntary cooperation in response to varying group growth rates. Using a laboratory public-good game, we construct a situation where increasing group size yields potential efficiency gains, but only with sustained cooperation. We then study the effect of exogenously varying growth rates on cooperation. Slow growth yields higher cooperation rates and welfare than fast growth, both for incumbents and entrants, which is consistent with optimistic self-reinforcing beliefs persisting under slower growth. Allowing incumbent group members to select growth rates also sustains high cooperation rates, but growth stalls at intermediate group sizes, leaving potential efficiency gains unrealized.

Voluntary cooperation, experiment, public good game

JEL Classification
C92, C72

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