 While there could be an infinite number of forms of surplus appropriation, the Marxist canon refers to ancient (independent), slave, feudal, capitalist, and communist class processes.In 1989, Wolff joined efforts with a group of colleagues, ex- and then current students to launch "Rethinking Marxism", an academic journal that aims to create a platform for rethinking and developing Marxian concepts and theories within economics as well as other fields of social inquiry.For more than two decades, he served as a member of the editorial board of the journal.