The empirical-historical analysis of the top incomes and their wealth are in the center with Thomas Piketty's "Capital" (2014). The share of the top 10% was never below 60% from 1917 to 2012. A wealth tax is vital to reverse the exploding inequality.
Free from the Rosa Luxemburg Foundation (tags)
"The World Crisis and Beyond," 178p, "The Idea of Global Social Rights," 4p and "The Turmoil within the Elite, the Course of the Crisis and the Left," 4p