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©2000 Pension Research Council of the Wharton School of the University of Pennsylvania. All Rights Reserved.
Support for this research was provided by the Pension and Welfare Benefits Administration of the U.S. Department of Labor; able research assistance was provided by Erica Dykes. Useful comments were provided by Daniel Beller, Phyllis Fernandez, David McCarthy, and Jack Vanderhei, though opinions and conclusions are solely those of the author.
Date Posted: 13 September 2019