Private policing and graduated sanctions sustain honest cooperation within a group

Evidence

In Naples and Milan the solution is more satisfactory: the service is allocated to the driver who claims to be closest to the customer’s address, and the risk of cheating is countered by the threat of punishment. Drivers have the right to police one another and, if in doubt about a call commandeered by another driver, are entitled to drive to the same address and, if they reach it first, to claim the customer for themselves. They may also report the culprit and have his radio disconnected for a period of time that increases according to the number of previous offenses. Other drivers are alerted to distrust driver X and monitor his behavior closely. Delays · cannot be attributed to unforeseen traffic problems (except for accidents), because drivers agree to assume that they should be capable of taking normal variations in traffic into account. Any incorrect estimate, in other words, is interpreted as evidence of cheating. — Diego Gambetta, The Sicilian Mafia The Business of…, 590

Categorization

• XREF: This is a near-textbook instance of the private-judges and reputation-based enforcement mechanisms from Milgrom, North and Weingast and from Gambetta’s own model of the Mafia as third-party enforcer. The graduated-disconnection sanction and mutual monitoring map directly onto community reputation enforcement. — connects to: Administered satisfaction produces voluntary compliance without terror. — Herbert Marcuse, One-Dimensional Man: Studies in the…, 333
• DEEPTHINKING: The design here — any incorrect estimate treated as cheating, no excuses for traffic, peers empowered to verify — shows how groups can construct enforceable truth regimes entirely from symmetric monitoring and graduated sanctions, with no central authority. The point that the same self-managed solution works in Naples where ‘mutual trust is certainly no more robust than in Sicily’ preempts the objection that cultural trust explains cooperation.