While necessary-labor produces nothing but human itself as a species of animals, surplus-labor creates human’s world as a whole. Human history is nothing other than the development of surplus-labor. At first it is the development of production force, which includes the raise of productivity of labor and the creation of new forms of surplus-labor. Fighting for and dominating the surplus-labor form the production relations. In a traditional society, all surplus labor was invested in the reproduction of the hierarchic social structure, resulting in subsistence of social material production system and stagnancy in social economic development. When the surplus-value as capital was introduced into material production system, the rapid expansion of social economy happened, which would contradic to itself and bring the society into crisis. The key question of our socialist market system is nothing other than to create a new form of production and distribution of surplus-labor. We should make use of the great energy of capital and bring it into the orbit of socialism. Illuminated in this way, the historical materialism, politic economics and scientific socialism would be combined together and go towards an integrated Marxist theory as a whole.
