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Group size in social-ecological systems.

Marco Casari1,2,3, Claudio Tagliapietra4

  • 1Department of Economics, University of Bologna, 40126 Bologna, Italy; marco.casari@unibo.it.

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|February 24, 2018
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Cooperation in large groups is challenging. Historical Alpine communities maintained stable group sizes for centuries despite population growth, indicating social factors, not ecology, dictate group limits.

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Area of Science:

  • Social-ecological systems research
  • Human cooperation dynamics
  • Common-pool resource management

Background:

  • Cooperation challenges increase with group size, but optimal group size limits remain unclear.
  • Understanding group size stability is crucial for managing common-pool resources sustainably.
  • Historical data offers insights into long-term social dynamics and cooperation limits.

Observation:

  • Examined centuries-old data from hundreds of Alpine communities managing common property resources.
  • Observed remarkable stability in average group size over approximately six centuries.
  • Noted regional population more than doubled during this period, while average group size remained constant.

Findings:

  • Average group size in these communities remained stable despite significant regional population increase.
  • Ecological factors (e.g., forest vs. pasture management) had minimal impact on group size.
  • Social interaction factors, including cognitive and decision-making constraints, significantly influenced group size.

Implications:

  • Suggests social and cognitive limits, rather than ecological factors, primarily constrain group size for cooperation.
  • Provides a historical basis for understanding the resilience and adaptive capacity of social-ecological systems.
  • Informs theories on the evolution of cooperation and the governance of shared resources.