Graphic: Whose Tax Rates Rose or Fell http://graphics8.nytimes.com/images/2012/04/13/opinion/sunday/0415web-leonhardt/0415web-leonhardt-popup.png Sources: Emmanuel Saez, University of California, Berkeley, and Thomas Piketty, Paris School of Economics; Census Bureau (median income change from 1960 to 2004) http://www.nytimes.com/imagepages/2012/04/13/opinion/sunday/0415web-leonhardt.html?ref=business