This year (2017) marks the 170^th anniversary of the publication of Karl Marx’s The Poverty of Philosophy, written in “reply” to Pierre-Joseph Proudhon’s System of Economic Contradictions published the year before. The book’s title is a play on the subtitle of Proudhon’s two volumes (“or, the Philosophy of Poverty”) and for Trotskyist Ernest Mandel “the prototype of that sort of implacable polemical writing which has often inspired the pens of Marx’s followers”.