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The HoneyComb Paradigm for Research on Collective Human Behavior
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Static network structure can stabilize human cooperation.

David G Rand1, Martin A Nowak2, James H Fowler3

  • 1Departments of Psychology, Economics, School of Management, and Yale Institute for Network Science, Yale University, New Haven, CT 06511; david.rand@yale.edu.

Proceedings of the National Academy of Sciences of the United States of America
|November 19, 2014
PubMed
Summary
This summary is machine-generated.

Static networks can stabilize human cooperation when the benefit to neighbors exceeds the cost. This finding contrasts with previous experiments and supports evolutionary game theory predictions.

Keywords:
Prisoner’s Dilemmaassortmenteconomic gamesevolutionary game theorystructured populations

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Area of Science:

  • Evolutionary Game Theory
  • Social Networks
  • Behavioral Economics

Background:

  • Theoretical models suggest network structure can promote cooperation.
  • Previous human experiments failed to demonstrate this effect.
  • Understanding factors stabilizing cooperation is crucial.

Purpose of the Study:

  • To experimentally demonstrate that static network structure can stabilize human cooperation.
  • To identify conditions under which network structure promotes cooperation.
  • To reconcile experimental findings with theoretical predictions.

Main Methods:

  • Human participants played a public goods game embedded in static networks.
  • Systematic variation of the benefit-to-cost ratio (b/c) of cooperation.
  • Systematic variation of the average number of neighbors (k).

Main Results:

  • Static networks achieved stable high cooperation levels, outperforming well-mixed populations.
  • High cooperation was observed when b/c > k.
  • Cooperation decayed when b/c ≤ k or networks were reshuffled.

Conclusions:

  • Static network structure can effectively stabilize human cooperation under specific conditions.
  • The ratio of benefit-to-cost and network topology are critical factors.
  • This study provides the first experimental evidence for network-structured cooperation in humans.