Yes, capitalism is working ... for the Forbes Global Billionaires whose ranks swelled from 322 in 2000 to 1,826 in 2015. Billionaires control the vast majority of the world’s wealth, 67 billionaires already own half the world’s assets; by 2100 we’ll have 11 trillionaires, while American worker income has stagnated for a generation. But for the vast majority of the world, capitalism is a failure. Over a billion live on less than two dollars a day. In his “Capital in the Twenty-First Century,” economist Thomas Piketty warns the inequality gap is toxic, dangerous. As global population explodes from 7 billion...