Across the globe, diverse innovators operating in the black, grey, and informal economies are developing solutions to a myriad of challenges. Far from being 'deviant entrepreneurs' that pose threats to our social and economic stability, they display remarkable ingenuity, pioneering original methods and practices that we can learn from and apply to more formal markets. This book investigates the stories of underground innovation that make up the 'misfit economy'. It examines the teeming genius of the underground and asks: who are these unknown visionaries? How do they work? How do they organise themselves? How do they catalyse innovation? And ultimately, how can you take these lessons into your own world?