The Lengthening of Childhood
---- Acknowledgements -----
We have benefited from the thoughtful comments of Joshua Angrist, Claudia Goldin, Richard Murnane, Deborah Stipek and workshop participants at the Federal Reserve Bank of Boston, Harvard, McGill, Michigan, Stanford and Syracuse. Kelly Bedard and Elizabeth Dhuey generously gave us their data on state school entry laws. Jessica Becker and Rezwan Haque provided excellent research assistance. We gratefully acknowledge the financial support of Harvard's Multidisciplinary Program on Inequality and Social Policy (Deming) and the Federal Reserve Bank of Boston and the Milton Fund (Dynarski). This paper is forthcoming in the Journal of Economic Perspectives (Summer 2008). The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.