Focusing on the new worker cooperative movement in the West, this study not only contains the first systematic discussion of the solidarity economy in the light of Marxist theory; it also introduces a major revision of Marxism that both updates it for the twenty-first century and illuminates our historical moment. It includes an analysis of the history of cooperatives in the U.S., showing where they went wrong and how we can correct their past mistakes. It has a case-study of the successful new worker-owned business New Era Windows in Chicago, which has been celebrated internationally for its defiance of conventional paradigms. And it shows a way out of the age-old conflict between Marxism and anarchism, arguing that both are more relevant now than they have ever been. Which is to say: a gradualist “revolution” is, for the first time, within the realm of possibility.