The debate over income inequality might just be the hottest development in economics in decades. Take French economist Thomas Piketty’s recent book on wealth and inequality. After flying off the shelves in France, it became a best-seller in the U.S. this spring. Politico magazine ran a piece on income inequality by Seattle-based entrepreneur Nick Hanauer two weeks ago. It quickly became one of the most shared stories in Politico’s history. Hanauer is a passionate advocate for raising the minimum wage. He warns that mega-millionaires like him must help close the gap between America’s haves and have nots. If they don’t, everyone will lose. A conversation with Nick Hanauer.