Papers written by Author(s): 'Jeffrey B Liebman'
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Working PaperRedistribution in the Current U.S. Social Security System
April 2002
Working Paper Number:
CES-02-09
Because its benefit formula replaces a greater fraction of the lifetime earnings of lower earners than of higher earnings, Social Security is generally thought to be progressive, providing a 'better deal' to low earners in a cohort than to high earners. However, much of the intra-cohort redistribution in the U.S. Social Security system is related to factors other than lifetime income. Social Security transfers income from people with low life expectancies to people with high life expectancies, from single workers and from married couples with substantial earnings by the secondary earner to married one-earner couples, and from people who work for more than 35 years to those who concentrate their earnings in 35 or fewer years. This paper studies the redistribution accomplished in the retirement portion of the current U.S. Social Security system using a microsimulation model built around a match of the 1990 and 1991 Surveys of Income and Program Participation to Social Security administrative earnings and benefit records. The model simulates the distribution of internal rates of returns, net transfers, and lifetime net tax rates from Social Security that would have been received by members of the 1925 to 1929 birth cohorts if they had lived under current Social Security rules for their entire lives. The paper finds that annual income-related transfers from Social Security are only 5 to 9 percent of Social Security benefits paid, or $19 to $34 billion, at 2001 aggregate benefits levels, when taxes and benefits are discounted at the cohort rate of return of 1.29 percent. At higher discount rates, Social Security appears to be more redistributive by some measures, and less redistributive by others. Because much of the redistribution that occurs through Social Security is not related to income, the range of transfers received at a given level of lifetime income is quite wide. For example, 19 percent of individuals in the top lifetime income quintile receive net transfers that are greater than the average transfer for people in the lowest lifetime income quintile.View Full Paper PDF
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Working PaperThe Distributional Effects of an Investment-Based Social Security System
April 2002
Working Paper Number:
CES-02-08
In this paper we study the distributional impact of a change from the existing pay-as-you-go Social Security system to one that combines both pay-as-you-go and investment-based elements. Such a transition can avert the large tax increases that would otherwise be necessary to maintain the level of benefits promised under current law as life expectancy increases. According to the Social Security actuaries (Board of Trustees, 1999), retaining the existing pay-as-you-go system would eventually require raising the current 12.4 percent Social Security payroll tax rate to about 19 percent to maintain the current benefit rules or cutting benefits by more than one-third in order to avoid a tax increase. In contrast, previous research showed that adding an investment-based component with savings equal to two percent of covered earnings to the existing 12.4 percent pay-as-you-go system would be sufficient to maintain the benefits promised under current rules without any increase in tax rates (Feldstein and Samwick 1997, 1998a, 1998b).View Full Paper PDF
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