Allgemeine Theorie der Beschäftigung, des Zinses und des Geldes
Keynesian economics derives from John Maynard Keynes, in particular his book "The General Theory of Employment, Interest and Money" (1936), which ushered in contemporary macroeconomics as a distinct field. The book focused on determinants of national income in the short run when prices are relatively inflexible. Keynes attempted to explain in broad theoretical detail why high labour-market unemployment might not be self-correcting due to low "effective demand" and why even price flexibility and monetary policy might be unavailing. The term "revolutionary" has been applied to the book in its impact on economic analysis.