"The slave is sold once and for all; the proletarian must sell himself daily and hourly. The individual slave, property of one master, is assured an existence, however miserable it may be, because of the master’s interest. The individual proletarian, property as it were of the entire bourgeois class which buys his labor only when someone has need of it, has no secure existence. This existence is assured only to the class as a whole. ... The slave is outside competition; the proletarian is in it and experiences all its vagaries. ... The slave frees himself when, of all the relations of private property, he abolishes only the relation of slavery and thereby becomes a proletarian; the proletarian can free himself only by abolishing private property in general. ... The proletarian works with the instruments of production of another, for the account of this other, in exchange for a part of the product. ... The proletarian liberates himself by abolishing competition, private property, and all class differences."