The overlapping generations model pioneered by Paul Samuelson is used to address an issue in Social Security. In the 1983 Social Security reform, Congress chose to build a substantial trust fund, with principal and interest both to be used for later benefits. That is, Congress chose payroll tax...

Social Security trust fund portfolio diversification to include some equities reduces the equity premium by raising the safe real interest rate. This requires changes in taxes. Under the hypothesis of constant marginal returns to risky investments, trust fund diversification lowers the price of...

Many political economic theories use and emphasize the process of voting in their explanation of the growth of Social Security, government spending, and other public policies. But is there an empirical connection between democracy and Social Security program size or design? Using some new...

What does the international history of old-age Social Security program design say about the forces creating and sustaining it as a public program? First, because many program features are internationally common, and/or explained by country characteristics, SS may emerge and grow due to...

What economic forces create and sustain old-age Social Security as a public program? We relate political, efficiency, and narrative theories of Social Security to empirical results reported in our companion paper in this volume. Political theories, including rational majority voting and pressure...