In his best selling book Capital in the Twenty-First Century, economist Thomas Piketty argues that capitalism has no tendency towards a fair distribution of wealth taking issue with the idea that inequality declines as capitalism matures. Piketty spent 15 years collecting data on global wealth and income—and he uses his figures to argue that the opposite is true. Capitalism, he says, tends naturally towards ever-greater inequality. Piketty's solution? A global wealth tax—something he admits has little chance of becoming a reality. Capital has attracted impassioned responses, both positive and negative. But it has also single-handedly re-kindled discussion of how ewe confront inequality.