The most remarkable thing that happened to the world economy after 9/11 was ...nothing. What would have once meant a crippling shock to the system was absorbed astonishingly quickly, partly due to the efforts of the then Chairman of the Federal Reserve Board, Alan Greenspan. The post 9/11 global economy is a new and turbulent system - vastly more flexible, resilient, open, self-directing, and fast-changing than it was even twenty years ago. "The Age of Turbulence" is an incomparable reckoning with the nature of this new world - how we got here,…