In the final analysis, the history of mankind is the history of production and the history of producers. The development and change of the mode of material production determines the development and change of the whole social history and the replacement of social forms. In the mode of material production, productivity is the most active and dynamic factor, which always develops forward, while the production relationship is relatively stable. With the development of productivity, the original relations of production have changed from the form of productivity development to the shackles of productivity development, from being suitable for productivity development to hindering productivity development.

The development of human history:

Only by changing the relations of production can the productive forces be liberated and developed. With the change of production relations (that is, economic base), all huge superstructures will develop and change sooner or later, thus causing the replacement of social forms. In a word, the history of human society is the history of material production and the history of labor development. It is from the history of labor development that Marx found the "key" to understand the history of human social development.