Duncan S. Gilchrist

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Since 2008, kidney exchange in America has grown in part from the incorporation of nondirected donors in transplant chains rather than simple exchanges. It is controversial whether these chains should be performed simultaneously 'domino-paired donation', (DPD) or nonsimultaneously 'nonsimultaneous extended altruistic donor, chains (NEAD). NEAD chains create(More)
Gentry and Segev (1) speculate above that the results reported in Ashlagi et al. (2), that nonsimultaneous extended altruistic donor (NEAD) chains produce more transplants than domino-paired donation (DPD), would be reversed if the computation were conducted for more periods. Here, we carry out the computation and show that, contrary to their conjecture,(More)
In an online experiment, we measure users' interactions with search engines, both in standard configurations and in modified versions with improved labels identifying search engine advertisements. In particular, for a random subset of users, we change " sponsored link " or " ad " labels to instead read " paid advertisement. " Relative to users receiving the(More)
This paper documents what economists have learned about UGC and social media. A growing body of evidence suggests that UGC on platforms ranging from Yelp to Facebook has a large causal impact on economic and social outcomes ranging from restaurant decisions to voting behavior. These findings often leverage unique data sets and methods ranging from(More)
In an online experiment, we measure users' interactions with search engines, both in standard configurations and in modified versions with clearer labels identifying search engine advertisements. In particular, for a random subset of users, we change " Sponsored links " or " Ads " labels to instead read " Paid Advertisements. " Relative to users receiving(More)
(non-simultaneous long DPDs of length k), NEAD-k (non-simultaneous long NEAD chain of length k), HLA (human leukocyte antigen). Abstract Since 2008 kidney exchange in America has grown in part from the incorporation of non-directed donors in transplant chains rather than simple exchanges. It is controversial whether these chains should be performed(More)
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