Note 4 — THE SOCIALIST ECONOMICS OF KARL MARX AND HIS FOLLOWERS[1]
Reading edition
Cf. Engels, Feuerbach (English translation, Chicago, 1903), especially Part IV, and various papers published in the Neue Zeit; also the preface to the Communist Manifesto written in 1888; also the preface to volume ii. of Capital, where Engels argues the question of Marx's priority in connection with the leading theoretical principles of his system.