1. The position of commerce in national economic development from the perspective of world economic development. The essence of market economy is exchange economy. Under the condition of market economy, the relationship between enterprises and markets is the closest. The history of world economic development shows that with the development of economy, the development center of primary, secondary and tertiary industries moves backward. The industrial structure has the characteristics of evolution from low-level equilibrium to high-level equilibrium, and its evolution focus is roughly: agriculture-light industry-basic industry-high-tech processing industry-modern service industry. Commerce and service industry are only important components of the tertiary industry. This situation is more obvious in developed countries. The tertiary industry, including commerce, plays an increasingly important role in the national economy and contributes more and more to the economy. The level of business development reflects the level of economic development to a certain extent.

According to the experience of various countries, the proportion of a country's commercial output value to GDP is positively related to the degree of marketization of its goods and services. Therefore, the contribution of business to GDP is also an important indicator to measure the degree of marketization of a country's economy. China's commerce has a low position in the national economy, and its output value position is not only lower than that of developed countries, but even lower than that of developing countries with similar overall and economic level in the world. This situation of business not only affects its own development, but also affects the sustainable development of the whole national economy.

2. The position of commerce in China's national economic development after the reform and opening up. The evolution trend of China's industrial structure is basically consistent with the general law in the process of industrialization in various countries, but the growth of the tertiary industry lags behind that of the secondary industry, and the proportion of output to GDP has not expanded significantly.

Through research, it is found that in 1980s, China effectively promoted the rapid growth of the tertiary industry, the speed of commercial development was greatly improved, and the industrial structure was significantly improved. However, in the 1990s, the proportion of tertiary industry did not increase significantly, and the share of commerce and catering industry only hovered around 8%. It reflects that the commercial development is relatively insufficient and its position in China's national economy is generally low.

3. The underlying causes of low business status. The low position of commerce in China's national economic development is directly related to the level of commercial development. The long-term planned economic system has made China's commercial development seriously lag behind the overall process of national economic development, which has caused various forms of ownership and various types of capital and labor to flood into commercial industries, especially individual businesses, with the deregulation of commercial fields after the economic system has turned to marketization. This change not only promotes the rapid expansion of commercial scale, but also brings a series of problems such as the intensification of miniaturization of commercial enterprises, low scale efficiency and slow technological progress, which seriously hinders the optimization of the internal structure of commercial industries.

In addition, the characteristics of commercial activities themselves, such as low organic composition of commercial capital and low entry threshold for industries, also objectively attract those investments with small capital scale and weak asset specificity. Compared with the primary and secondary industries, business does not particularly need physical strength and highly specialized labor, so it naturally becomes an important way to solve social employment.