Stare decisis allows common law to develop gradually and incrementally. We show how judge-made law can steadily evolve and tend to increase efficiency even in the absence of new information. Judges' opinions must argue that their decisions are consistent with precedent: this is the more costly,...

In a model where biased judges can distort contract enforcement, we uncover positive feedback effects between the use of innovative contracts and legal evolution that improve verifiability and contracting over time. We find, however, that the cost of judicial bias also grows over time because...

The paper deals with a bilateral accident situation in which victims have heterogeneous costs of care. With perfect information,efficient care by the injurer raises with the victim's cost. When the injurer cannot observe at all the victim's type, and this fact can be verified by Courts,...

We study the standard economic model of unilateral accidents, in its simplest form, assuming that the injurers have limited assets.We identify a second-best optimal rule that selects as due care the minimum of first-best care, and a level of care that takes into account the wealth of the...

Moral codes are produced and enforced by more or less specialized means and are subject to standard economic forces. This paper argues that the intermediary role played by the Catholic Church between God and Christians, a key difference from Protestantism, faces the standard trade-off of...

This paper documents and studies the gender gap in performance among associate lawyers in the United States. Unlike most high-skilled professions, the legal profession has widely-used objective methods to measure and reward lawyers' productivity: the number of hours billed to clients and the...

Assuming that the degree of discretion granted to judges was the main distinguishing feature between common and civil law until the 19th century, we argue that constraining judicial discretion was instrumental in protecting freedom of contract and developing the market order in civil law. We...

In an experiment we study market outcomes under alternative incentive structures for third-party enforcers. Our transactions resemble an anonymous credit market where lenders can give loans and borrowers can repay them. When borrowers default, judges are free to enforce repayment but are...

We argue that during the crystallization of common and civil law in the 19th century, the optimal degree of discretion in judicial rulemaking, albeit influenced by the comparative advantages of both legislative and judicial rulemaking, was mainly determined by the anti-market biases of the...

We argue that in the development of the Western legal system, cognitive departures are the main determinant of the optimal degree of judicial rule-making. Judicial discretion, seen here as the main distinguishing feature between both legal systems, is introduced in civil law jurisdictions to...