"The results of the analysis suggest that changes over the past 65 years in the top marginal tax rate and the top capital gains tax rate do not appear correlated with economic growth. The reduction in the top tax rates appears to be uncorrelated with saving, investment, and productivity growth. The top tax rates appear to have little or no relation to the size of the economic pie. However, the top tax rate reductions appear to be associated with the increasing concentration of income at the top of the income distribution. As measured by IRS data, 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. At the same time, the average tax rate paid by the top 0.1% fell from over 50% in 1945 to about 25% in 2009. Tax policy could have a relation to how the economic pie is slicedâlower top tax rates may be associated with greater income disparities." http://www.dpcc.senate.gov/files/documents/CRSTaxesandtheEconomy Top Rates.pdf The report is extensive, but the reasoning behind its conclusion is fairly straightforward. The richest Americans are the least likely to spend extra money they get as a result of a tax cut, and are more likely to save it or invest it offshore. Those on the lower end of the economic spectrum, meanwhile, are the most likely to spend transfer payments they receive from the government.