The recent economic events driven by the great financial crisis of 2007-08 has challenged some "dogma", highlighting various limits and drawbacks of current paradigms. The crisis showed the limitations of monetary policy and led to a revaluation of what levels of public debt can be considered safe. This volume aims to refresh the debate on some important long-run macroeconomic issues from new and fresh perspectives. Theoretical Foundations of Macroeconomic Policy raises a number of questions relating to the challenges faced by macroeconomic theory and policies. The common line is the long run and policy perspective. The first part of the book is devoted to the theory of growth and productivity. The second part concentrates on long-run effects of fiscal and monetary policy. Specifically, topics investigated by the international range of authors are the theory of optimal growth, the productivity policies and production function estimations, demand- vs. supply- driven growth, optimal debt default and the incompleteness of financial markets, the long-run optimal inflation target and its relationship with public finance, the long term effects of government budget constraints on growth, and effect on optimal policies in non-market clearing environment.The book will be of interest to postgraduates, researchers, and academics studying macroeconomics and fiscal policies.