The Second Machine Age is here. Two MIT economists create a playbook for how businesses can adapt to our new digital future. Erik Brynjolfsson and Andy McAfee are co-founders the Initiative on the Digital Economy at MIT Sloan. Their new book is “Machine, Platform, Crowd: Harnessing Our Digital Future.” We speak with Erik and Andy about the great economic rebalancing of minds and machines, physical products and virtual platforms, core competencies and the wisdom of the crowd.