effectivetaxrateontop5pct-and-rateneededtoincreasetaxrevenuesby10pctofgdp-us-1960to2013 Published June 20, 2016 at 767 × 479 in effectivetaxrateontop5pct-and-rateneededtoincreasetaxrevenuesby10pctofgdp-us-1960to2013