The Materialist Conception of History
"The methods by which social man satisfies his needs, and to a large extent these needs themselves, are determined by the nature of the implements with which he subjugates nature in one degree or another; in other words, they are determined by the state of his productive forces. Every considerable change in the state of these forces is reflected in man’s social relations, and, therefore, in his economic relations, as part of these social relations. The idealists of all species and varieties held that economic relations were functions of human nature; the dialectical materialists hold that these relations are functions of the social productive forces."
