More from the Author

• Working Paper | 2012

  The Need for (long) Chains in Kidney Exchange

  Itai Ashlagi, David Gamarnik, Michael A. Rees and Alvin E. Roth

  It has been previously shown that for sufficiently large pools of patient-donor pairs, (almost) efficient kidney exchange can be achieved by using at most 3-way cycles, i.e., by using cycles among no more than 3 patient-donor pairs. However, as kidney exchange has grown in practice, cycles among n>3 pairs have proved useful, and long chains initiated by non-directed, altruistic donors have proven to be very effective. We explore why this is the case, both empirically and theoretically. We provide an analytical model of exchange when there are many highly sensitized patients and show that large cycles of exchange or long chains can significantly increase efficiency when the opportunities for exchange are sparse. As very large cycles of exchange cannot be used in practice, long non-simultaneous chains initiated by non-directed donors significantly increase efficiency in patient pools of the size and composition that presently exist. Most importantly, long chains benefit highly sensitized patients without harming low-sensitized patients.

  Citation:

  Ashlagi, Itai, David Gamarnik, Michael A. Rees, and Alvin E. Roth. "The Need for (long) Chains in Kidney Exchange." NBER Working Paper Series, No. 18202, July 2012.

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• Editorial | American Journal of Transplantation | December 2011

  NEAD Chains in Transplantation

  Itai Ashlagi, Duncan S. Gilchrist, Alvin E. Roth and Michael A. Rees

  Citation:

  Ashlagi, Itai, Duncan S. Gilchrist, Alvin E. Roth, and Michael A. Rees. "NEAD Chains in Transplantation." American Journal of Transplantation 11 (December 2011): 2780–2781. (Letter to the Editor.)

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• Conference Presentation | 13 Oct 2011

  Family Enterprises: Beyond the Three Circles

  John A. Davis, A. Kinkade and J. Richardson

  Keywords: Family Business;

  Citation:

  Davis, John A., A. Kinkade, and J. Richardson. "Family Enterprises: Beyond the Three Circles." Paper presented at the Family Firm Institute Annual Conference, Boston, MA, October 13, 2011.

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