Option 2: 1936 -> "The General Theory of Employment, Interest and Money" was published by John Maynard Keynes in 1936. This groundbreaking work revolutionized economic theory by introducing concepts like aggregate demand, the multiplier effect, and the role of government intervention during economic downturns. It was written during the Great Depression and challenged classical economic theories, establishing the foundation of modern macroeconomics and Keynesian economics. -> correct