Taxes and the Economy: An Economic Analysis of the Top Tax Rates Since 1945

"Throughout the late-1940s and 1950s, the top marginal tax rate was typically above 90%; today it is 35%. Additionally, the top capital gains tax rate was 25% in the 1950s and 1960s, 35% in the 1970s; today it is 15%. The real GDP growth rate averaged 4.2% and real per capita GDP
increased annually by 2.4% in the 1950s. In the 2000s, the average real GDP growth rate was
1.7% and real per capita GDP increased annually by less than 1%. There is not conclusive
evidence, however, to substantiate a clear relationship between the 65-year steady reduction in the top tax rates and economic growth. Analysis of such data suggests the reduction in the top tax rates have had little association with saving, investment, or productivity growth. However, the top tax rate reductions appear to be associated with the increasing concentration of income at the top of the income distribution. The share of income accruing to the top 0.1% of U.S. families
increased from 4.2% in 1945 to 12.3% by 2007 before falling to 9.2% due to the 2007-2009
recession. The evidence does not suggest necessarily a relationship between tax policy with
regard to the top tax rates and the size of the economic pie, but there may be a relationship to how the economic pie is slice.."