This book is devoted to examining the lasting impact of The General Theory and Keynes's thought on macroeconomic theory, methodology and its relevance for understanding the financial and economic crises challenges of the 21st Century. A number of contributions take their departure from Keynes's presentation during the 1930s of his new macroeconomic understanding and its policy implications. The book also discusses pluralistic views of Keynes's ideas and their importance for contemporary debates. The General Theory and Keynes for the 21st Century develops the analysis of money and banking, and the intertwined relationship between financial and real-world activities throughout. It demonstrates how vital Keynes's work is to understanding the failure of the globalised financial system as well as pointing to an alternative way forward. The broad scope and richness of the contributions are reminders of how most books severely misrepresent The General Theory and therefore fail to act as a guide to 21st Century policy. As such, this book is a necessary tool for scholars, researchers and advanced students of economics, as well as policy makers who wish to create a more just society in the face of the current deregulated global market economy.