NBER Retirement Research Center Paper No. NB 07-13
Issued in February 2010
---- Acknowledgements -----
This research was supported by the U.S. Social Security Administration through grant #10-P-98363-1-04 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 author and do not represent the views of SSA, any agency of the Federal Government, or the NBER. I am grateful to Daniel Hamermesh and two referees for helpful comments and suggestions.