The US Social Security System: What Does Political Sustainability Imply?

This paper examines how political constraints can shape the social security system under different demographics. A steady-state mapping between relevant economic and demographic variables and the social security tax rate resulting from a majority voting is provided. I calibrate an OLG model to the U.S. economy. Calculations using census population and survival probabilities projections and 1961-96 labor productivity growth deliver a social security tax rate of 13.3% (currently 11.2%) and a 54% replacement ratio (51.7%). This result reflects the median voter's aging, from 44 to 46 years, which dominates the decrease in the dependency ratio, from 5.45 to 4.72. (C) 1999 Academic Press