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Keynes' macroeconomic revolution is based on his microfoundations of economic behavior derived from 'casual' observations but impressively substantiated by rigorous research in behavioral economics and neurology. Ronald Schettkat argues that the allegation of the missing microfoundations in Keynes' theory is false. Instead, both Keynes' theory and behavioral economics relate to humans in 'the economy we live in', differing substantially in their fundamentals from the neoclassical model. Showing that Keynes' micro has much in common with Behavioral Economics, the book starts with the fundamentals ranging from the methodological approach to economics as a real versus an axiomatic science and the consequences for knowledge building methods (interviews, observations, experiments), the rationality and equilibrium concepts to the functioning of markets, before delving into the topics in greater detail. Providing a thorough theoretical grounding in economics, this book will be a discerning read for economists, students of economics, political science, sociology and psychology as well as for the general public.