John Maynard Keynes (1883-1946) is perhaps the foremost economic thinker of the twentieth century. On economic theory, he ranks with Adam Smith and Karl Marx; and his impact on how economics was practiced, from the Great Depression to the 1970s, was unmatched. The General Theory of Employment, Interest and Money was first published in 1936. But its ideas had been forming for decades ? as a student at Cambridge, Keynes had written to a friend...