The idea that inequality is rising is being used to explain everything from tribalism to low voter turnout. But how much is known about the gap between the haves and the have-nots, is it growing and why does it matter? Economist Thomas Piketty, dubbed “the modern Marx” for his theories on how wealth concentrates, talks to Anne McElvoy and Henry Curr, The Economist’s economics editor, about his new book, “Capital and Ideology”. They debate how unfair societies can learn from their mistakes and whether inequality is ever in the public interest. Also, why Piketty would like to pay more tax on his bestsellers, and what life with three daughters has taught him about equality in the home

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