Peerless and prolific, Professor Colin Williams has again produced an essential guide for anyone wanting a concise yet sophisticated introduction to contemporary issues in the informal economy. With admirable clarity and precision, Professor Williams deftly explains the magnitude, characteristics and drivers of the informal economy. Nuanced assessments of theoretical and policy choices inform the roadmap this text provides to understanding such an integral feature of the global economy. Seasoned scholars and newcomers alike will find value in Professor Williams latest contribution to this important topic. -- Monder Ram, Aston University, UK An indispensable book to understanding one of the most important policy challenges of the 21st century: how to facilitate transition from the informal to the formal economy to ensure sustainable development and decent work. Professor Williams provides an intelligent, evidence-based and well-structured critical contribution to the knowledge of both the concept of informal economy and policy options for tackling the informal economy. -- Frédéric Lapeyre, International Labour Organization Colin Williams book is a must read classic for anyone looking for an in depth understanding of the informal economy. . . the book nails the pulse of the modern informal system. -- Anjula Gurtoo, Indian Institute of Science, India This book provides an excellent bridge between academia and policymakers by offering a synthesis of the latest state of research in the field of the informal economy, presented in an easy to understand and yet a comprehensive way. Critical insights for researchers and policymakers in the field of tax administration, labour and social security policies are provided. -- Ioana Alexandra Horodnic, Alexandru Ioan Cuza University of Iai, Romania