Richard Posner Made the Law Explain Its Consequences.

His legacy is larger than efficiency

The University of Chicago Law School described Posner as a pioneer of law and economics and one of the most influential legal scholars of his era. He joined the faculty in 1969, entered the Seventh Circuit in 1981, served as chief judge from 1993 to 2000, and retired in 2017. Those facts explain his reach. They do not explain why lawyers still recognize a Posner opinion within a few paragraphs.

The recognizable feature was pressure. He pressed an asserted interest until it produced a mechanism. He asked what behavior a rule would reward, who would bear its cost, whether an institution could administer it, and whether the stated justification described the actual world. Economic analysis supplied tools for that work, but the method was not simply a command to maximize wealth.

In his 1998 essay Values and Consequences, Posner described economics as a way of clarifying the effects of legal choices, not a complete moral system. People respond to incentives. Resources have alternative uses. A rule can shift costs without eliminating them. Information is expensive and unevenly distributed. Those propositions do not decide which values deserve protection. They make it harder to defend a rule while refusing to say what the rule does.

That distinction matters because law and economics can be caricatured in opposite directions. Admirers can treat efficiency as a neutral answer to contested questions. Critics can treat any discussion of incentives as moral evasion. Posner's best work supports neither shortcut. Consequences do not replace values. They test whether the chosen legal means plausibly serve the values a lawyer or judge invokes.

A legal interest needs a working theory

Baskin v. Bogan, the 2014 decision invalidating Indiana's and Wisconsin's same-sex marriage bans, shows the method without requiring agreement with every sentence. Indiana argued that marriage law addressed accidental procreation by encouraging biological parents to raise their children together. Posner did not answer with a competing slogan. He examined the claimed mechanism.

The opinion asked why a state concerned about children would withhold marriage from same-sex couples who were already raising children, including adopted children. It examined the benefits marriage supplied and the harms imposed on families excluded from them. The states' justification weakened because its categories did not fit its stated purpose. The question was not simply whether responsible childrearing is a legitimate interest. It was whether the challenged rule advanced that interest in a coherent way.

That is a useful model for advocacy. When government or a private litigant invokes safety, efficiency, deterrence, privacy, market stability, or child welfare, the next question should be operational. Through what sequence of behavior does this rule produce that outcome? What evidence supports the sequence? Who is excluded or burdened? What less restrictive or more direct mechanism is available? A legitimate objective does not validate every instrument attached to it.

The same discipline belongs in commercial litigation. A party seeking a noncompete should explain the information or relationship at risk and how the restriction protects it. A company defending an automated screen should identify what the signal measures and how errors are corrected. A firm claiming a billing method rewards efficiency should show what conduct it actually rewards. The legal label begins the analysis. It does not finish the causal story.

Rowe v. Gibson shows both the value and the danger

Posner's method was most controversial when the record seemed disconnected from obvious reality. In Rowe v. Gibson, an incarcerated man alleged that prison medical staff gave him acid-reflux medication many hours before meals, when he said it did not prevent severe pain. The district court granted summary judgment to the defendants. The Seventh Circuit reversed, with Posner writing the majority.

The opinion consulted publicly available medical sources about when the medication should be taken and criticized a process in which an unrepresented prisoner had no practical access to a qualified expert while the defendants relied on an affidavit from a doctor who was also a defendant. Posner said the claim could survive without the internet material and recommended an impartial expert on remand. He treated the imbalance in access to evidence as part of the reliability problem.

Judge David Hamilton's dissent identified the institutional danger. Appellate judges are not investigators. Facts found through a judge's own research have not been authenticated, tested through cross-examination, or answered by the parties. A court that rescues one litigant from a defective record may create a rule under which different judges import different facts into different cases. The concern is not formalism for its own sake. It is notice, consistency, and the division of labor between advocate, expert, trial court, and appellate court.

Both sides saw something real. An adversary system can produce a formally complete but substantively unreliable record when one party lacks counsel, money, discovery, or expert access. Judicial research can expose that failure. It can also replace one inequality with unreviewable judicial choice. The better lesson is not that judges should browse until a case feels right. It is that courts and lawyers need procedures capable of developing the facts on which doctrine honestly depends.

Pragmatism is not permission to ignore hierarchy

The sharpest criticism of pragmatic judging is that consequences can become a respectable name for personal preference. A judge selects which effects matter, predicts them with imperfect information, and may discount rules that constrain the preferred result. Posner's confidence sometimes gave that criticism evidence.

But his record also contains an important counterexample. In Khan v. State Oil, the Seventh Circuit followed Supreme Court precedent requiring a particular antitrust rule even while Posner's opinion explained why the precedent's economic foundation had deteriorated. The Supreme Court later overruled its prior decision and praised the lower court for following controlling law while identifying the problem.

That sequence captures a legitimate form of judicial and professional candor. A lower court can apply binding precedent without pretending it is persuasive. A lawyer can preserve an argument for review without telling the trial judge to disregard the hierarchy. An agency can administer a statute while explaining why experience supports amendment. Consequence-focused analysis is strongest when it illuminates the law's operation and weakest when it claims the authority to bypass the institution assigned to change it.

The University of Chicago Law Review later described Posner as an instigator, a judge willing to make a problem visible even when the governing rule controlled the immediate outcome. That role has value. Legal systems learn slowly when opinions hide uncertainty, institutional failure, or obsolete assumptions. Candor creates a record on which a higher court, legislature, regulator, or later case can act.

The practical test for a lawyer's argument

Posner's death invites broad claims about influence. The most useful tribute is narrower. Before presenting a rule, ask what it causes. Identify the people whose conduct is supposed to change, the incentive or constraint that changes it, the evidence that supports the prediction, and the institution responsible for administration. Then test the costs that the argument places outside its frame.

Build that analysis into the record. An appellate brief cannot repair a causal theory that never received evidence below. If the case depends on medicine, markets, technology, accounting, workplace behavior, or agency operations, decide early which facts require experts, documents, data, or testimony. A clever mechanism described for the first time at oral argument is not a substitute for proof.

State uncertainty rather than disguising it. Consequences are often contested and prediction is not observation. A defensible argument distinguishes established facts, reasonable inferences, expert opinion, institutional experience, and advocacy. Posner's willingness to look outside conventional materials made some opinions vivid. It also demonstrates why source, method, and opportunity to respond matter.

Finally, do not confuse practical reasoning with short-term convenience. Administrability, reliance, equal treatment, precedent, and public confidence are consequences too. A result that feels efficient in one case may make the system less predictable across a thousand cases. Pragmatism earns its name only if it accounts for the institution as well as the immediate dispute.

Richard Posner did not leave lawyers an algorithm. He left a recurring demand: connect the rule to the world. The demand can discipline doctrine, expose empty justifications, and reveal people the record has made invisible. It can also exceed the proper role of a judge when confidence outruns evidence. That tension is not a defect in his legacy. It is the reason the legacy remains worth arguing about.