* Qu’est-ce que la propriété? ou Recherches sur le principe du droit et du gouvernement, Paris, 1841, pp. 201–2. This is the celebrated work in which Proudhon comes to the conclusion that ‘property is theft’. Proudhon’s critic here, Eugène Forcade (1820–69), was simply a ‘vulgar economist’ whose antipathy to Proudhon’s ideas expressed little more than class interest.