Capitalism advanced the human condition, said Schumpeter, through a “perennial gale of creative destruction,” which he likened to a Darwinian process of natural selection to secure the “survival of the fittest.” As Greenspan tells it, the “rougher edges” of creative destruction were legislated away by Franklin Roosevelt’s New Deal, but after the wave of de-regulation of the 1970’s, America recovered much of its entrepreneurial, risk-taking ethos.