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History
- Accepted January 1, 2012
- Published online October 25, 2012.
Copyright & Usage
© 2012 by the Board of Regents of the University of Wisconsin System
Author Information
- David Powell
- David Powell is an economist at RAND. He is grateful to David Autor, Arthur Campbell, Tom Chang, Jesse Edgerton, Michael Greenstone, Tal Gross, Jon Gruber, Jerry Hausman, Helen Hsi, Konrad Menzel, Whitney Newey, Amanda Pallais, Jim Poterba, Nirupama Rao, Hui Shan, and Carmen Taveras for their comments
- With the exception of restricted fatality numbers, the data used in this article can be obtained beginning May 2013 through April 2016 from David Powell; 1776 Main St., Santa Monica, CA 90407, dpowell{at}rand.org.