What are the five dominant industries?

Primary industry: including agriculture, forestry, animal husbandry, sideline and fishery.

Secondary industry: including manufacturing, mining, construction and public works, sewage, gas and health departments.

Tertiary industry: also known as service industry, refers to other industries other than the primary and secondary industries. Including commerce, finance, insurance, real estate, transportation, communications, services and other non-material production sectors.

The fourth industry is an extension of the first three industries, which refers to the public industry that has no obvious profit for itself but can enhance the profits of other industries. It can also be called knowledge industry or information industry.

The fifth industry, also known as cultural industry, refers to a series of activities of producing, reproducing, storing and distributing cultural products and services according to industrial standards. The fifth industry belongs to the category of intelligent industries, including consulting, planning, advertising, literature and art, science and education. It directly obtains and uses people's own intelligent resources to meet the needs of people or institutions in knowledge, culture and technology.

In industrial economics, industry has three levels:

(1) The first level is the industry divided by the same commodity market, that is, the industrial organization. In reality, the relationship structure of enterprises in different industries is different.

The enterprise relationship structure in an industry has an extremely important impact on the economic benefits of the industry. In order to achieve the best economic benefits, an industry must meet two conditions: first, the nature of the enterprise relationship structure in the industry makes the enterprises in the industry have enough pressure to improve their operations, improve their technology and reduce their costs; Secondly, make full use of "economies of scale" to make the unit cost of enterprises the lowest.

(2) The second layer is the industry that is divided based on the similarity of technology and technology, that is, industrial association. In the process of social reproduction in a certain period of a country, various industrial departments have input and output through certain economic and technological relations, that is, the movement of intermediate products, which truly reflects the proportional relationship and changing law in the process of social reproduction.

(3) The third level is roughly based on the stage of economic activities, which divides the national economy into several industries, that is, industrial structure.