Guardian: When Bill de Blasio took the oath of office as mayor of New York City on 1 January, his inauguration address focused heavily on inequality. In a speech four weeks earlier, President Obama made reducing economic inequality a core mission, saying: "For the rest of my presidency, that's where you should expect my administration to focus all our efforts." Inequality is a critical issue globally. A society where the gains of economic growth go only to the already wealthy is not stable. That said, I believe...