Commonwealth is the third book co-authored by Michael Hardt and Antonio Negri. As with the previous two books, Empire and Multitude, the task of this book is to both critique the present order and provide the concepts for a radical transformation of that order. This review examines how this third, and f.inal book in the series, changes the argument of the other two, specifically examining the role that the concept of the common plays in restructuring the idea of critique, politics, and political economy.