The sequence of antagonistic 'revolutions' and counter-revolutions' between Keynesian and Classical Economics was in the end quite sterile. Fostering a dialogical conception of economics argument, we reconstruct the Pigouvian analytical 'node' and the debate unfolding between Keynes and Pigou. The Cambridge 'Keynesians' Joan Robinson and Richard Kahn broke that fledging dialogue and infelicitously abandoned a number of Keynes' - and also some of their own - central conceptions. Re-thinking this dialogue leads to new analytical paradigms and perspectives. INDICE PART I: THE SPENT REVOLUTIONS: LOST DIRECTIONS IN ECONOMIC DEBATES The Volatility in Macroeconomic Paradigms The Problem of Authenticity in Keynesian Economics The Problem of Authenticity in 'Classical' Economics Pigou as Keynes' Classic The Question of Fairness An Abstract of the Arguments PART II: THE PIGOUVIAN NODE Questions and Methods Pigou's 'Real Demand for Labour' Workings of the Basic Pigouvian Model Keynes' Internal C