Economic Policy Institute. January 26, 2015.
This report uses the latest available data to examine how the top 1 percent in each state have fared over 1917–2012, with an emphasis on trends over 1928–2012. The analysis finds that all 50 states have experienced widening income inequality in recent decades. [Note: contains copyrighted material].
http://s3.epi.org/files/2014/IncreasinglyUnequalStatesofAmerica1917to2012.pdf [PDF format, 34 pages].
