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Reciprocity: weak or strong? What punishment experiments do (and do not) demonstrate.
1Department of Economics, University of Milan, 20122 Milan, Italy. francesco.guala@unimi.it
The Behavioral and Brain Sciences
|February 1, 2012
Summary
Human sociality may evolve through weak reciprocity (long-term cooperation) or strong reciprocity (costly punishment). Evidence suggests real-world cooperation relies more on institutions than individual costly punishment.
Area of Science:
- Evolutionary economics
- Behavioral biology
- Social psychology
Background:
- Theories of human sociality distinguish between weak reciprocity (long-term cooperation, deterring free-riders) and strong reciprocity (costly punishment for uncooperative behavior).
- Experimental evidence supports strong reciprocity, showing willingness to punish free-riders at personal cost, even in one-shot games.
Purpose of the Study:
- To differentiate between a narrow (measuring psychological propensities) and a wide (replicating real-world mechanisms) interpretation of punishment experiments.
- To assess whether costly punishment observed in labs is a valid mechanism for cooperation in real-world situations.
Main Methods:
- Distinguishing between narrow and wide readings of experimental evidence on reciprocity.
- Analyzing anthropological data on cooperation in small egalitarian societies.
- Examining historical and economic studies on the resolution of social dilemmas.
Main Results:
- No evidence found that cooperation in studied small societies is enforced by costly punishment.
- Social dilemmas in real-world contexts are typically resolved by institutions coordinating punishment, reducing its cost, and extending cooperation horizons.
- Laboratory findings on costly punishment do not directly translate to widespread real-world cooperation mechanisms.
Conclusions:
- The wide interpretation of punishment experiments requires validation with 'in the wild' evidence, which is currently lacking for costly punishment.
- Institutional frameworks, rather than decentralized costly punishment, appear to be the primary mechanism sustaining cooperation in many real-world scenarios.
- Findings suggest limitations on the forms of cooperation sustainable through decentralized policing and highlight the role of institutional design.
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