We test a mechanism whereby groups are formed endogenously, through the use of voting. Once formed, groups play a public-goods game, where there are economies of scale: in two treatments the social value of an incremental contribution to the group account increases with the size of the group,...

Transplants of donated stem cells save the lives of many patients with blood diseases. Donation is somewhat painful, but rarely has lasting adverse effects. Patients can accept transplants only from donors with compatible immune systems. Those lacking a sibling match must seek donations from the...

We investigate the nature of continuous-time strategic interactions in public-goodsgames. In one set of treatments, four subjects make contribution decisions in continuous timewhile in another they make them only at discrete points of time. The effect of continuous timeis muted in public-goods...

We tested the effects of various of policy rules on retailer behavior in laboratory experiments conducted at Hewlett-Packard Laboratories. Our experimental design models the multifaceted contemporary market for consumer computer products and is quite complex, but we found that participants can...

Traffic congestion is a substantial time cost for many urban commuters. This paper studies the response of subjects in an experimental setting in which subjects choose between a short direct route that becomes increasingly congested as more people travel on it and a more indirect route that does...

This paper investigates whether information about generosity or fairness can be useful in lowering dispute costs and enhancing bargaining efficiency. Subjects were first screened using a dictator game, with the allocations chosen used to separate participants into two types. Mutually anonymous...