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http://en.wikipedia.org/wiki/Thomas_Piketty
Thomas Piketty, a French economist is author of "Capital in the Twenty-First Century" ( 2013), which, according to the wikipedia entry on Piketty, "emphasizes the themes of his work on wealth concentrations and distribution over the past 250 years," arguing that "the rate of capital return in developed countries is persistently greater than the rate of economic growth, and that this will cause wealth inequality to increase in the future."
"To address this problem," according to wikipedia, Piketty "proposes redistribution through a global tax on wealth."