SOURCES: Tom Petska and Mike Strudler, “Income, Taxes, and Tax Progressivity: An Examination of Recent Trends in the Distribution of Individual Income and Taxes” (Statistics of Income Division, Internal Revenue Service, 1997); Thomas Hungerford, “Taxes and the Economy: An Economic Analysis of the Top Tax Rates Since 1945” (Congressional Research Service, 2012); Economic Report of the President, 2012; Bureau of Economic Analysis (bea.gov); Organization of Economic Cooperation and Development, OECD STAT.