Immaterial labor is a Marxist, Autonomist framework to describe how value is produced from affective and cognitive activities, which, in various ways, are commodified in capitalist economies. The concept of immaterial labor was coined by Italian sociologist and philosopher Maurizio Lazzarato in his 1996 essay "Immaterial Labor", published as a contribution to Radical Thought in Italy and edited by Virno and Hardt. It was re-published in 1997 as: Lavoro immateriale. Forme di vita e produzione di soggettività. (Ombre corte). Lazzarato was a participant in the Autonomia Operaia group as a student in Padua in the 1970s, and is a member of the editorial group of the journal Multitudes. Post-Marxist scholars including Franco Berardi, Antonio Negri, Michael Hardt, Judith Revel, and Paolo Virno, among others have also employed the concept.