Two parties sign a contract but before they fully perform they modify the contract. Should courts enforce the modified agreement? The modification may enable efficient trade in response to changed circumstances, or one party may have made an efficient relationship-specific investment and then...

Blockchain technology offers firms a novel method of raising capital, via so-called Initial Coin Offerings (ICOs). In the most novel form of an ICO, a firm creates digital assets called "utility tokens" that are tracked on a blockchain-based ledger; requires that its product be purchased only...

Blockchain front-running involves multiple agents, other than the legitimate agent, claiming a payment from performing a contract. It arises because of the public nature of blockchain transactions and potential network congestion. This paper notes that disputes over payments are similar to...

Blockchain consensus is a state whereby each node in a network agrees on the current state of the blockchain. Existing protocols achieve consensus via a contest or voting procedure to select one node as a dictator to propose new blocks. However, this procedure can still lead to potential attacks...

Sender conveys scarce information to a number of receivers to maximize the sum of receiver payoffs. Each receiver's payoff depends on the state of the world and an action she takes. The optimal action is state contingent. Under mild regularity conditions, we show that the payoff of each receiver...

Physicians prescribing drugs for patients with schizophrenia and related conditions are remarkably concentrated in their choice among antipsychotic drugs. In 2007 the single antipsychotic drug prescribed by a physician accounted for 66% of all antipsychotic prescriptions written by that...

This paper describes randomized field experiments in eighty-four urban public schools in two cities designed to understand the impact of aligned incentives on student achievement. In Washington DC, incentives were "horizontal" - provided to one agent (students) for various inputs in the...

We analyze a rational-expectations model of information acquisition and price formation in an intermediate- good market: prices and net supply are non-negative, there are no noise traders, and the intermediate good has multiple potential uses. Several of our results differ from the classic...

We analyze a rational-expectations model of price formation in an intermediate-good market under uncertainty. There is a continuum of dyads, each consisting of an upstream party and a downstream party. Both parties can make specific investments at private cost, and there is a machine that either...

The foundations of incomplete contracts have been questioned using or extending the subgame perfect implementation approach of Moore and Repullo (1988). We consider the robustness of subgame perfect implementation to the introduction of small amounts of asymmetric information. We show that...