From the macro theory:
GDP is the market value of all final products and services produced by a country in a certain period of time. Then we can start with products and services; Buyers of products and services; The seller of products and services is calculated according to three aspects (because the total amount of the three is the same)
Domestic production, national income and domestic expenditure reflect the whole process of production, distribution and use within a country. Production not only increases products and services, but also generates income. Income forms expenditure, which in turn determines production. The three are interrelated and cyclical. Therefore, the calculation indexes of the three methods are consistent.
As far as calculation details are concerned:
1. Expenditure method (buyer)
The value of final products and services is realized through transactions, in which there are buyers and sellers. Expenditure accounting is to calculate the total expenditure of the whole society to buy the final product in a certain period of time. Expenditure is generally divided into four categories according to buyers: residents' purchase (consumption), enterprises' purchase (investment), government purchase and foreign purchase (export). Total expenditure = consumption+investment+government purchase+export
2. Income method (seller)
The money obtained after the transaction is realized is distributed. Income method is the income obtained through various factors, that is, the proportion of the cost of producing products and providing services to GDP. So it can be calculated from the projects that have been allocated funds. Generally divided into factors of production such as wages, interest, rent (employees, individuals, equipment land owners); Income of non-corporate business owners (self-satisfied with additional benefits); The company's pre-tax profit; Enterprise transfer payment and enterprise indirect tax (also regarded as cost); Capital depreciation (the cost that must be paid).
3. Production method (direct calculation of products and services)
This method directly calculates the total value of products and services. The value of products produced by each enterprise consists of two parts: the value of intermediate products such as materials, energy and tools purchased from other enterprises; The newly created value of the production factors invested by oneself. Therefore, we only need to calculate the added value of enterprises in the process of production and sales. So it is also called value-added method. According to different industries: for departments in 1 2 industries, added value = total output-intermediate products; The added value (profit) of commerce, transportation, finance and service industry in the tertiary industry is calculated according to net income, and the added value (non-profit) of government education and health is calculated according to wages and salaries.
I wonder if you understand this analysis?