Ulric B. and Evelyn L. Bray Social Sciences Seminar

Wednesday April 28, 2021 12:00 PM

Unpaired Kidney Exchange: Overcoming Double Coincidence of Wants without Money (with Julien Combe, Yinghua He, Victor Hiller, Robert Shimerk and Olivier Tercieux)

Speaker: Mohammad Akbarpour, Graduate School of Business, Stanford University
Location: Online Event

Abstract: For an incompatible patient-donor pair, kidney exchanges often forbid receipt-before-donation (the patient receives a kidney before the donor donates) and donation-before-receipt, causing a double-coincidence-of-wants problem. Our proposal, the Unpaired kidney exchange algorithm, uses "memory" as a medium of exchange to eliminate these timing constraints. In a dynamic matching model, we prove that Unpaired delivers a waiting time of patients close to optimal and substantially shorter than currently utilized state-of-the-art algorithms. Using a rich administrative dataset from France, we show that Unpaired achieves a match rate of 57 percent and an average waiting time of 440 days. The (infeasible) optimal algorithm is only slightly better (58percent and 425 days); state-of-the-art algorithms deliver less than 34 percent and more than695 days. We draw similar conclusions from the simulations of two large U.S. platforms. Lastly, we propose a range of solutions that can address the potential practical concerns of Unpaired.

How to view the seminar:
Sign up for a free twitch.tv account, and tune in on Wednesdays at noon pacific time on twitch.tv/caltechecontheory. You will be able to ask questions on the twitch chat.

Series Ulric B. and Evelyn L. Bray Social Sciences Seminar Series

Contact: Letty Diaz letty.diaz@caltech.edu