Patients needing kidney transplants may have donors who cannot donate to them because of blood or tissue incompatibility. Incompatible patient-donor pairs can exchange donor kidneys with other pairs only when there is a quot;double coincidence of wants.quot; Developing infrastructure to perform...

Mechanisms that rely on course bidding are widely used at Business Schools in order to allocate seats at oversubscribed courses. Bids play two key roles under these mechanisms to infer student preferences and to determine who have bigger claims on course seats. We show that these two roles may...