Before the financial crisis, fiscal policy often played a secondary role to monetary policy, with the manipulation of interest rates to hit inflation targets being the main instrument of macroeconomic management. However, after the financial crisis and the subsequent euro crisis, fiscal policy has been brought back to the fore. In the past, the limited understanding of the effects of fiscal policy, neglect of monetary-fiscal interactions, faulty institutional set ups or ignorance of market expectations often led to bad policies. This book, written by a team of leading economists, seeks to address the current oversight of fiscal policy and to upgrade our understanding and conduct of fiscal policy, presenting a well-balanced diagnosis and offering several important lessons for future fiscal analysis and policymaking. It is an essential read for academics and graduate students focused on the current debate over fiscal policy, as well as policy-makers working on day-to-day policy issues.