This volume honors the work of the influential economist Axel Leijonhufvud. His work in macroeconomics, monetary theory and European economic history has spurred great discussion over many years, and the authors of this book comprise some of the very best economists active today. The broad influence of his work is evident in the variety of subjects his readers address. The topics range from Keynesian economics and the economics of high inflation to the micro-foundations of macroeconomics and economic history. The reader will find an intriguing compilation of ideas ranging from bankruptcy and collateral debt, the macroeconomics of broken promises, interest rate setting, growth patterns of macro models, innovation history to macroeconomics with intelligent autonomous agents. Scholars and students of economic history, Keynesian economics and alternative monetary theory will be delighted with the work inspired by this influential thinker.