"Work is the basis of man’s social existence. This is stressed by every social theory. In this respect, however, the problem is not that work is the basis of human existence. The problem relates to the nature of work: Is it in opposition to or in harmony with the biologic needs of masses of people? Marx’s economic theory proved that everything that is produced in the way of economic values comes about through the expenditure of man’s living working power, and not through the expenditure of dead material."