This book is the second part of my Real Marx Series research.

The book proposes that Marx regarded the basic units of social economy as micro Production subject, and the nation-state and human society as macro production subject, Productivity and production relations, economic foundation and superstructure are the material content and social form of social micro and national macro Production subject. The trend of the contradiction movement between the actual micro-production subject and the national-state macro-production subject is to realize communism—a "community of free men" in which the entire human society is a unit.

Historical materialism is the theory about the contradiction and development trend of micro and national macro production subjects, "Das Kapital" is a theory about the contradictions and development trends between the micro and macro production subjects of capitalism. "Das Kapital" specifically reflects or reproduces the logic of historical materialism. This interpretation of historical materialism makes the basic categories of historical materialism concrete, clear, logically rigorous and clear, structured reasonable and scientific, and can reflect the reality, times and integrity of Marxism.