One of Time's 100 Most Important People of the Twentieth Century, John Maynard Keynes revolutionized economic thinking with The General Theory of Employment, Interest, and Money.Published following the Great Depression, this classic challenged the established classical economics, particularly the proposition that a market economy tends naturally to restore itself to full employment on its own. More relevant than ever in the twenty-first century, the principles of the "Keynesian Revolution" continue to be debated in a world ravaged by inequitable economic circumstances. "[Keynes's] radical idea that governments should spend money they don't have may have saved capitalism."—Time