International Trade, also known as trade, refers to cross-border transactions of goods and services, generally composed of import trade and export trade, so it can also be called import and export trade. International trade is also called world trade. Import and export trade can adjust the utilization rate of domestic production factors, improve the international supply and demand relationship, adjust the economic structure, increase fiscal revenue and so on.

International trade belongs to the discipline of economics, mainly based on economic theories, including microeconomics, macroeconomics, international economics, econometrics, introduction to world economics, political economy, etc.

Since the major of international economics and trade is economics, it is naturally inseparable from the study of mathematics. Calculus, linear algebra, probability theory and mathematical statistics are essential, and the study of econometrics, international economics, statistics and other disciplines must have a relatively solid mathematical foundation. Engaged in international trade, English should be quite good, not only written English, such as foreign trade English correspondence, oral English is also very important.

The source of the word "trade" is "Shang Junshu · Kaisai", "the two names are easy to trade, can not be ignored", meaning that the two are similar on the surface, but the actual difference is easy to change, can not be unaware. It is obvious from Shang Yang's words that he did not like merchants, but such a criticism of merchants was later shortened to "trade", and lost its original derogatory meaning, and became a neutral word. Why was it a derogatory term in the first place?

Earlier Confucius said in "The Analects of Confucius · Advanced" that "the return is also its ordinary, repeated empty." If you give, you will not receive orders, but if you inherit, you will receive billions." It can be seen that the earlier the era, the more China does not like businessmen. The origin of "merchants" is obviously from the Yin Shang, perhaps because the Spring and Autumn Period and the Warring States belong to the Zhou Dynasty, naturally will not like the behavior of an overthrown dynasty, just like the Jews do business, and not the favor of other mainstream European nations, although the Bible is written by the Jews.

Jews are taught Jewish customs, language, and business from an early age. In the book of Genesis, Joseph, the son of Jacob, stockpiled grain in Egypt for seven consecutive good years, and then sold the grain in seven consecutive bad years, resulting in Egypt becoming a slave country. The story took place around 1650 BC, when China was in the middle and early Shang Dynasty. It can be found that the merchants were closely related to the establishment of slavery. The master is naturally the debtor, as in the United States, which today issues the national debt and owes the most foreign debt, and the slave is the creditor, as in Japan.