As we all know, the Song Dynasty has always been a weak country. But historian Chen Yinque said: "China's civilized behavior was extremely created during the Zhao and Song Dynasties after thousands of years of development." The Song Dynasty was actually weak, but it was never weak. At that time, the behavior of Chinese civilization not only reached the peak of ancient China in science and technology, but also reached the peak in the financial industry that China people were not good at at at all. Its crystal is the first paper money in the world.

In the second year of Emperor Zongtiansheng of Song Dynasty (A.D. 1024), Yizhou government began to sell the world's first paper money guaranteed by state power-Jiaozi. In fact, at this time, the development of Yizhou society has long been accustomed to doing business with paper money, and the recitation of the court in the Song Dynasty is just the crown of financial technology such as Jiaozi.

We know that the commercial economy in Song Dynasty was very developed. Porcelain, satin and tea in the Song Dynasty were always out of stock in overseas trade. In deep-sea seaports such as Guangzhou, Quanzhou, Hangzhou and Mizhou, cargo ships in the Song Dynasty transported inland industrial products to Japan, India, Persia, Arabia and Southeast Asia. Because the Song Dynasty was at the core of import and export trade, people engaged in cross-border trade used copper coins officially minted in the Northern Song Dynasty as the settlement currency.

Finally, Japan, South Korea and Southeast Asian countries all use Song copper coins directly imported through import and export trade as their domestic trade, and the historical position of Song copper coins at this stage is above the US dollar. Other countries' trade with Song copper coins affirmed the credit and economic development of the Northern Song Dynasty, but it also brought great problems to the economic development of the Song Dynasty: currency loss and currency shortage, which was the most serious in Sichuan Province, which lacked copper in ancient times, that is, Yizhou area at that time.

At this stage, you can find a lot of information by starting the search engine and entering "Sichuan Tin Mine". However, the Song people did not have excellent exploration technology and could not develop and design copper resources in Sichuan. The copper coins officially minted in the Northern Song Dynasty will once again flow abroad. Without non-copper coins, Sichuanese would return to the ancient times of bartering. There is no way to cast money with iron in Sichuan.

The practical value of iron is much lower than that of copper. In the market price at that time, the ratio of copper coins to iron coins was 10 1, and the problems that could always be solved with copper coins needed 10 iron coins. According to historical records, it takes 20,000 wentie to buy cloth in Sichuan, weighing about 500 Jin. People with 500 Jin of iron money also need four or five people to move, buy a house and release the land. Can iron money move for seven or eight days alone?

In order to facilitate the issuance of currency, a unique financial enterprise-Jiaoziwu appeared in Sichuan. Customers bring inconvenient iron money and leave it in Jiaozi's shop. Jiaozi Store issues capital certificates to customers, prepares to exchange iron money for customers anytime and anywhere in advance, and charges customers a handling fee according to the amount and time of savings. The fund owned by this kind of jiaozi expansion has been proved to be jiaozi, and the jiaozi introduced by folk customs is also called personal jiaozi. How did the money exchange in the northern song dynasty happen and how did it end after it became strong?

In fact, Sichuan's extreme monetary system is one of the reasons for Jiaozi's prosperity. Without the rapid development of science and technology in the Northern Song Dynasty, Jiaozi could not be accepted by the times. Nowadays, people are afraid of receiving counterfeit money when shopping. People in the Song Dynasty are no exception. In order to prevent someone from forging contacts, people in the Song Dynasty made watermarks and wear-resistant special paper with exquisite printed copper plates, black, red and blue prints and hand-carved images, and signed and sealed them on the spot to achieve the purpose of anti-counterfeiting identification. Indeed, sexual intercourse at that time was more difficult than printing money now.