As the stock market crash of 1929 plunged the world into turmoil, two men emerged with competing claims on how to restore balance to economies gone awry. John Maynard Keynes, the mercurial Cambridge economist, believed that government had a duty to spend when others would not. He met his...

"The Great Recession of 2008 restored John Maynard Keynes to prominence. After decades when the Keynesian revolution seemed to have been forgotten, the great British theorist was suddenly everywhere. The New York Times asked, "What would Keynes have done?" The Financial Times wrote of "the...