TY - JOUR AU - Feldstein,Martin AU - Liebman,Jeffrey B. TI - Social Security JF - National Bureau of Economic Research Working Paper Series VL - No. 8451 PY - 2001 Y2 - September 2001 UR - http://www.nber.org/papers/w8451 L1 - http://www.nber.org/papers/w8451.pdf N1 - Author contact info: Martin S. Feldstein President Emeritus NBER 1050 Massachusetts Avenue Cambridge, MA 02138-5398 Tel: 617/868-3905 Fax: 617/868-7194 E-Mail: msfeldst@nber.org Jeffrey B. Liebman John F. Kennedy School of Government Harvard University 79 JFK Street Cambridge, MA 02138 Tel: 617/495-8518 Fax: 617/496-9053 E-Mail: jeffrey_liebman@harvard.edu AB - This paper, a forthcoming chapter in the Handbook of Public Economics, reviews the theoretical and empirical issues dealing with Social Security pensions. The first part of the paper discusses pure pay-as-you-go plans. It considers the effects of introducing such a plan on the present value of consumption, the optimal level of benefits in such plans, and the emprical research on the effects of pay-as-you-go pension systems on labor supply and saving. The second part of the paper discusses the transition to investment-based systems, analyzing the effect on the present value of consumption of such a transition and considering such issues as the distributional effects and risk associated with such systems. ER -