We thank Paul Beaudry, Mark Bils, Pierre Cahuc, David Card, Jonathan Cribb, Eric French, Alex Gelber, Nataniel Hendren, Sacha Kapoor, Lawrence Katz, Mashfiqur Khan, Henrik Kleven, Patrick Kline, Alan Manning, Nicole Maestas, Lucija Muehlenbachs, Emmanuel Saez, Gustavo Ventura, Kent Weaver, Basit Zafar, Josef Zweimüller, and seminar and conference audiences at London School of Economics, Institute for Fiscal Studies, UC Berkeley, University of Michigan, UQAM, University of Zurich, Erasmus University, Vanderbilt University, VATT, Arizona State University, American Economic Association, European Economic Association, the SOLE/EALE joint meeting, the Paris-London Public Economics Conference, and the Economic Day at Rennes for helpful comments and suggestions. This research was supported in part by funding from the Social Sciences and Humanities Research Council in Canada and the U.S. Social Security Administration through grant #RRC08098400-09 to the National Bureau of Economic Research as part of the SSA Retirement Research Consortium. The findings and conclusions expressed are solely those of the authors and do not represent the views of SSA, any agency of the Federal Government, or the NBER. We thank the Swiss Federal Social Insurance Office for supporting data access. Rafael Lalive thanks the UC Berkeley Center for Labor Economics for its hospitality while writing substantial parts of this paper. All remaining errors are our own. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.