John Maynard Keynes' response to the extreme distress of the early years of the Great Depression produced The General Theory, which represented an overhaul of the macroecomics inherited by his generation. The ecomic upheaval (including the Great Recession) since 2008 raised serious doubts about the relevance of ecomics as it had come to be formulated and taught by the beginning of this century. While numerous books and articles have addressed the current distress of ecomies through contributions to specific parts of macroecomics, ne has offered an attractive alternative that represents a general overhaul of the macroecomics inherited by the current generation. A Reformulation of Keynesian Ecomic does so, and provides a modern integrated version of macroecomics for the modern ecomies as they function.This book's many insights and invations include: discarding the classical concepts of the long run and the short run in favour of the behavioural concepts of the planning period (the long term) and the short term (the operating period); discarding the exogeus production function in favour of an endogeus one; distinguishing between the short-term and the long-term production functions; replacing the dynamic stochastic tional general equilibrium (DSGE) approach for the short term by a more general one that permits effective equilibrium and disequilibrium in specific markets; and, a reformulation of the financial sector analysis and of the Keynesian business cycle theory. This thoroughgoing revision of macroecomics is must-read for macroecomists, policymakers and graduate students. It can even be used as a textbook by instructors who question the inherited orthodoxy built around the DSGE model and are looking for an alternative formulation of macroecomics.