This important new book illuminates our understanding of Sraffa and his work in three key areas. Firstly, Roncaglia re-examines Sraffa's intellectual biography, including his friendships with Gramsci, Wittgenstein and Keynes. Secondly, the book presents a new interpretation of his main work, Production of Commodities by Means of Commodities. Finally, the author provides a survey of the 'Sraffian schools', bringing Italian debates on Sraffa to an English-speaking audience.