Dealer A buys $100,000 in rough diamonds from Supplier B on oral credit and does not pay.

Under contract doctrine, the analysis is straightforward. Who was harmed? Supplier B, who was promised $100,000. How much harm? $100,000. The court awards expectation damages. Supplier B is made whole. Case closed.

From the network’s perspective, the analysis is not closed. It is just beginning. Every member of the bourse who relied on the threat of expulsion to make handshake credit possible was also harmed. The aggregate harm is not $100,000 but the shared confidence that made unsecured credit rational across the entire network. Paying Supplier B $100,000 does not restore that confidence, because every other dealer has just watched a cheater pay a judicially determined fee and retain membership. The matter is just beginning, because every dealer who extended credit on a handshake must now recalculate whether the handshake is still worth anything.

No amount of money paid to Supplier B addresses the harm to the network. A court could double or triple the damages. The governance system would still deteriorate, because the problem is not the amount but the category of remedy. Expulsion removes the cheater from the network. Damages leave the cheater inside at a judicially determined price.

The wrong plaintiff

This Article makes a diagnostic claim. Contract remedies doctrine identifies the individual promisee as the injured party when breach occurs within a collectively governed trading network. That identification is incomplete. An injured party is also the network: every member whose willingness to cooperate depended on the credible threat of exclusion.

The claim rests on connecting three bodies of scholarship that have not previously been joined. Buchanan’s theory of club goods explains the economic structure of what network members share: a good that is nonrivalrous among members and excludable from rule-breakers through expulsion. Calabresi and Melamed’s distinction between property rules and liability rules explains what happens when a court intervenes: judicial action converts the network’s exclusion authority from a property rule (only the network can revoke membership) into a liability rule (a court determines the price of continued membership). The Bernstein-Greif-Landa-Ostrom empirical literature documents what these networks actually look like and why they work.

Neither Buchanan nor Calabresi and Melamed wrote about trading networks. Bernstein, Greif, and their colleagues documented network governance without characterizing it in club-goods terms. Connecting the two reveals something that neither body of scholarship makes visible on its own: the credible threat of exclusion is a club good, and anything that undermines excludability degrades the good into a public good subject to free-riding.

Why exclusion works

Standard contract theory predicts that unsecured credit between strangers will be routinely exploited. Yet four independent bodies of research document near-zero default rates in trading networks that operate without courts.

Diamond dealers routinely buy and sell rough stones worth tens to hundreds of thousands of dollars on forty-five-day oral credit with no written contract. Among Bernstein’s informants, there was a single case of missed payment over decades of trading. Maghribi traders in the eleventh century sent goods on consignment across the Mediterranean to agents they had never met, relying on a coalition that reported cheaters and coordinated collective refusal to deal. Ostrom documented fisheries, irrigation systems, and grazing lands maintained with shared rules for centuries, without courts or police. Bernstein’s later study of the cotton industry found yet another instance: trade associations with arbitration systems backed by the power to expel.

One-on-one reputation is too weak to explain this pattern. In a large network, any particular pair of traders transact infrequently or only once. If the only consequence of cheating is losing one relationship, the cheater faces a low cost: one lost counterparty among hundreds. Hirschman distinguished between “exit” (leaving voluntarily) and “voice” (complaining from within); in a collectively governed network, the group wields a third option: forced exit. A dealer deciding whether to skip a $100,000 payment weighs the savings against the loss of every future business relationship in the industry. That loss is worth millions of dollars over a career. Expulsion, not one-on-one reputation, is what makes the calculus overwhelmingly favor compliance.

Calibration matters more than finality

Ali and Miller’s formal analysis of ostracism adds a refinement that matters for how courts interact with exclusion authority. They proved that permanent ostracism — where a guilty member is expelled forever with no possibility of readmission — is self-defeating when communication among members is strategic. Once a member learns that a cheater will be permanently expelled, that member’s “social collateral” with the cheater vanishes. The member has no reason to report the cheating truthfully, because the member no longer anticipates future dealings with the expelled cheater. Concealing guilt and exploiting remaining partners becomes individually rational.

Temporary ostracism with the possibility of forgiveness solves this problem. When guilty members face eventual readmission, innocent members retain a forward-looking incentive to report cheating truthfully, because they anticipate cooperating with the punished member again.

This result has a direct implication for judicial intervention. A network’s governance power depends not on the finality of exclusion but on the network’s unilateral authority over the exclusion decision, including when and whether to readmit. A network that can calibrate sanctions — forgiving minor first offenses, imposing temporary exclusion for moderate violations, permanently expelling repeat offenders — governs more effectively than one limited to a single sanction. When a court displaces that calibration authority, the court does not simply override one expulsion decision. The court eliminates the network’s ability to calibrate. That loss is worse than the loss of any single expulsion, because calibration — the ability to distinguish accidental from deliberate breach, to forgive the dealer who missed payment because of a family medical emergency and to expel the dealer who strategically tested limits — is what Ali and Miller showed makes the exclusion system effective.

The property-to-liability conversion

When courts do not intervene, the network’s exclusion authority operates as a property rule. Only the network, through its own governance processes, can revoke membership. No outside party can buy a cheater’s way back in.

Judicial intervention converts that property rule into a liability rule. The conversion takes three forms, each with the same structural consequence.

First, a court may award expectation damages to the promisee, compensating the counterparty but leaving the breacher inside the network, insulated from the full consequences of exclusion. Second, a court may impose procedural requirements on the expulsion process — notice, hearing, proportionality review — converting the network’s governance authority into something that operates only when a court is satisfied with the procedures. Third, a court may stay an expulsion pending judicial review, during which the expelled member retains access to the network and every other member observes that expulsion is not immediate and not final.

Each form produces the same result: exclusion authority is no longer absolute. A property rule has been converted into a liability rule.

Neither condition that Calabresi and Melamed identified for preferring liability rules holds in the network context. Bargaining within the network is not costly — the network’s own governance system is the low-cost mechanism for resolving disputes. And the value of the club good cannot be reduced to a dollar figure, because that value depends on the credibility of the exclusion threat, which is precisely what the damages remedy undermines. Awarding damages does not transfer a right from one party who values it less to another who values it more. Awarding damages degrades the right. No subsequent transaction can restore a governance system whose credibility depended on the certainty of exclusion.

Four doctrinal contexts

This is not hypothetical. Courts encounter the wrong-plaintiff problem in four live doctrinal contexts.

Trade usage under the UCC. Section 1-303(c) allows courts to supplement contracts with trade usages — customs so widely followed that parties are assumed to have incorporated them. When a trade usage is actually a network governance rule enforced through communal expulsion, treating it as a contractual term between two parties severs the rule from the collective enforcement that gave it power. In the diamond industry, the actual norm governing payment is contextual and flexible — payment is expected promptly, but the network tolerates short delays for good reasons and not for bad ones. A court restating the norm as a precise contractual term (“payment is due within forty-five days of delivery”) will be accurate in surface content but wrong in operative function.

Judicial review of expulsion from exchanges and cooperatives. In Silver v. New York Stock Exchange, the Supreme Court required “adequate procedural safeguards” before allowing the exchange to regulate membership. In Northwest Wholesale Stationers v. Pacific Stationery, the Court acknowledged that cooperatives must “establish and enforce reasonable rules in order to function effectively” but treated that acknowledgment as a reason to evaluate the practice under the rule of reason rather than per se condemnation — not as a reason to ask what remaining members lose when expulsion authority becomes subject to judicial review. In Alpine Securities Corp. v. FINRA (D.C. Cir. 2024), the property-to-liability-rule conversion proceeds incrementally: FINRA retains authority to discipline and expel members, but that authority is now qualified by the possibility that a court will stay the expulsion, review the procedures, and reverse the decision.

Antitrust treatment of network exclusion. Antitrust law frames network exclusion as a potential restraint of trade: the analysis asks whether the excluded party suffered competitive harm, not whether exclusion serves a governance function that every other member depends on. But antitrust’s own rule-of-reason analysis already provides the doctrinal framework for drawing this line. The BMI v. Columbia Broadcasting System Court recognized that some collective arrangements among competitors produce shared benefits that no individual member could create alone, and that condemning such arrangements outright destroys those shared benefits without advancing competition.

Platform deactivation. Amazon, Uber, and Airbnb operate governance systems with structural parallels to the diamond network. When courts review platform deactivation decisions one user at a time, asking whether a particular seller or driver received adequate process, the analysis replicates the same wrong-plaintiff problem. The deactivated user is visible and sympathetic. The harm to the platform’s governance system — sustained by the credible threat of deactivation — is invisible to the court.

What this paper does not do

I leave the remedial question open. Identifying the network as an injured party is analytically prior to choosing a remedy. Several possibilities deserve exploration: courts might enforce network arbitration agreements under a framework analogous to the Federal Arbitration Act’s presumption in favor of arbitrability; a standing doctrine might give remaining network members a voice in litigation involving the network’s expulsion authority; courts might decline to incorporate network customs as trade usages when those customs serve a governance function rather than a price-setting function.

But the diagnostic claim comes first. Contract remedies doctrine identifies the wrong plaintiff. The harm to the network — the degradation of a governance system whose value depends on the credibility of exclusion — is invisible in a framework that sees only the promisee. Making it visible is the prerequisite to getting the remedy right.

Read the full article: Seth C. Oranburg, The Wrong Plaintiff: Contract Damages Versus Network Expulsion and the Collapse of Distributed Governance, SSRN (2026). SSRN