Reputation systems fail because monitoring and sanctioning are costly public goods.

Evidence

In the model we develop below, this second problem has multiple aspects. First, traders must be motivated to execute sanctions against Cheaters when that is a personally costly activity. Second, traders must be motivated to keep well enough informed to know when sanctions are required, even though information gathering activities may be personally costly and difficult to monitor. In effect, one who keeps informed about who should be punished for past transgressions is supplying a public good; he deters the traders from cheating against others. Moreover, in our model, no other trader except his current partner will ever know if a trader does not check his partner’s past history, so the trader could avoid supplying the public good without facing any sanction from future traders. Third, traders who are cheated must be motivated to document the episode, even though providing documentation may be personally costly. After all, from the cheated trader’s perspective, what’s lost is lost, and there may be little point in “throwing good money after bad.” But if players who are cheated are unwilling to invest in informing their neighbors, then, just as surely as if the neighbors are unwilling to invest in being informed, the Cheater will profit from his action and Honest trade will suffer. These are the problems that the trading institution in our model must solve. — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 78

Categorization

• XREF: Directly parallels the reading purpose: institutional economics of private-order enforcement. This is the public-goods problem Gambetta and Milgrom et al. both address — the free-rider problem in collective punishment. — connects to: Bilateral reputation systems fail because information and sanctioning are costly public goods — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 78; Reputation systems need cheap information flow, not frequent repeated trade, to enforce honesty. — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 13; Private trade-enforcement systems fail when wealth transfer is costly — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 118 (+1 more)
• DEEPTHINKING: The insight that NOT checking a partner’s history is itself an unobservable free-riding act — enforced only by the current partner’s norms, not future traders — is a subtle and non-obvious failure mode for reputation institutions.

Related

• Bilateral reputation systems fail because information and sanctioning are costly public goods (similarity 0.92)
• Reputation systems need cheap information flow, not frequent repeated trade, to enforce honesty. (similarity 0.87)
• Trade institutions must solve both an information and a punishment-motivation problem (similarity 0.84)
• Pre-state commercial law judges made reputation systems work where direct knowledge failed (similarity 0.82)
• Informal punishment fails because traders won’t boycott lucrative partners (similarity 0.81)
• Reputation alone cannot sustain honest trading without third-party registration. (similarity 0.80)
• Private trade-enforcement systems fail when wealth transfer is costly (similarity 0.80)
• Costly information, not infrequent trade, is the core obstacle to honest exchange. (similarity 0.80)
• Costly information is what breaks informal trade enforcement. (similarity 0.80)
• Institutions emerge where information is costly, not where enforcement is absent. (similarity 0.79)
• Private-judge trading systems succeed only when enforcement costs stay low (similarity 0.79)
• Pre-state trading communities sustained honesty through reputation systems backed by private judges. (similarity 0.79)
• Full-history information institutions are too costly for efficient trade (similarity 0.79)
• Word-of-mouth reputation alone cannot sustain honest trade. (similarity 0.79)
• Some enforcement costs are unavoidable for sustaining honest exchange. (similarity 0.78)

Broader Connections

• Bilateral reputation systems fail because information and sanctioning are costly public goods #corroborates (1.00) — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 78
• Private trade-enforcement systems fail when wealth transfer is costly #corroborates (0.75) — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 118
• Extralegal reputation-based contracting can work in large markets when information flows cheaply. #qualifies (0.75) — Lisa Bernestein, Opting out of the Legal System, 178
• Reputation systems need cheap information flow, not frequent repeated trade, to enforce honesty. #qualifies (0.70) — PAUL R. MILGRO, PAUL R. MILGRO - THE ROLE OF…, 13