Efficient Kidney Exchange: Coincidence of Wants in Markets with Compatibility-Based Preferences
研究肾脏移植中因血型或组织不兼容而无法直接捐赠的患者-捐赠者对，如何通过两方或三方交换实现移植，并发现发展三方交换能显著提高移植数量，而更大规模的交换效率提升有限。
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 “double coincidence of wants.” Developing infrastructure to perform three-way as well as two-way exchanges will have a substantial effect on the number of transplants that can be arranged. Larger than three-way exchanges have less impact on efficiency. In a general model of type-compatible exchanges, the size of the largest exchanges required to achieve efficiency equals the number of types.