Which economist, author of 'The General Theory of Employment, Interest and Money', heavily influenced the New Deal and post-war economic policy with his advocacy of government intervention?

• A Milton Friedman
• B Friedrich Hayek
• C Paul Samuelson
• D John Maynard Keynes ✓

Keynesian economics, which argued that aggregate demand determined economic output, shaped U.S. fiscal policy from the New Deal through the 1970s.