2. Industry refers to the organizational structure system of business units or individuals engaged in production, services or other economic and social activities of the same nature in the national economy, also known as departments. But from a strict definition, the concept of industry is greater than industry, and an industry can span (include) several industries.
3. The national economy is the sum of various economic components composed of all walks of life, and its basic units are enterprises, institutions, administrative units and families.
4. The observation of the national economy can be carried out from both static and dynamic perspectives: from a static perspective, the national economy is composed of various units with economic interests in all walks of life in a country or region. From a dynamic point of view, it is all aspects of social reproduction. That is, the continuous recovery process from production to circulation to final use.