The Origins of Economic Theory -- Adam Smith{u2019}s Wealth of Nations -- David Ricardo{u2019}s Principles of Political Economy -- Karl Marx{u2019}s Das Kapital -- The Structure of Classical Theory -- The Structure of the Neoclassical Theory -- Theory of Capital and Cambridge Controversies -- Between Competition and Monopoly -- Keynes{u2019}s General Theory -- The Neoclassical Synthesis -- Disequilibrium Macroeconomics: From Its Brief Ascent to the Rapid Decline -- The Rise and Fall of Monetarism -- New Classical Macroeconomics -- The Real Business Cycles Approach -- The Return of (New) Keynesian Economics -- Economic Theory in Historical Perspective.