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Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsMaureen HartAlex Farrell coauthored this article while serving as a research fellow at the John F. Kennedy School of Government at Harvard University in Cambridge, Massachusetts. He is currently a post-doctoral fellow in the Department of Engineering and Public Policy at Curnegie Mellon University in Pittsburgh, Pennsylvania.
Farrell et al. (Sun,) studied this question.