Quantitative economic policy and econometrics were developed along with macroeconomics in the 1930s. Econometric techniques and models are still being used extensively in the business of forecasting and policy advice. In particular, policy simulations with econometric models have become standard tools for evaluating and designing macroeconomic stabilization policies. For instance, such studies provided important arguments for the popularization of the recent steps towards European integration such as the European Single Market, the European Monetary Union, and the Enlargement of the European Union. In this book, some recent advances in the theory and applications of quantitative economic policy are presented, with particular emphasis on fiscal and monetary policies in a European and global context. Andrew Hughes Hallett, a pioneer and major scientist in quantitative economic policy analysis, is being honoured by this volume, whose contributors are among his friends and former students.