“By 1980, the work of Feldstein, Boskin, Summers, and others had convinced many economists that U.S. taxes were in fact a significant obstacle to investment. Nor was this all: another major U.S. policy, the Social Security system, was also discouraging saving and investment.”Paul Krugman book Peddling ProsperitySource: Peddling Prosperity (1994), Ch. 2 : Taxes, Regulation, and Growth