7Engen, E. M. , Gale, W. G. ,and Scholz, J. K.. Do Saving Incentives Work? [J]. Brookings Papers on Economic Activity 1994,(1) : 85 -151.
8Poterba, James M. , Venti, Steven F. , and Wise, David A.. Do 401 (K) Contributions Crowd out Other Personal Saving? [J]. Journal of Public Economics, 1995, 58 : 1 - 32.
9Venti, Steven F. , and David A. Wise. The Wealth of Cohorts : Retirement Saving and the Changing Assets of Older Ameri-cans[R]. National Bureau of Economic Research Working Paper, 1996 : 5609.
10Benjamin, Daniel J.. Does 401 (k) Eligibility Increase Saving? Evidence from Propensity Score Subclassification [J]. Jour- nal of Public Economics,2003, 87 : 1259 - 1290.