When our currency first appeared, it appeared in the form of shells. At this time, money is the only natural currency. Therefore, when creating characters later, words related to money or value are mostly next to the shell word. However, with the development of social productive forces, people's trade volume has also increased, and the value of shells can no longer be used as the currency for people to conduct business activities. Thus, the copper shell appeared. Of course, the appearance of bronze shell can not be separated from the development of bronze at that time. But there was another problem at that time, that is, the currency was not unified.
The Qin dynasty unified the whole country, and the currency naturally faced unification. As a result, the emergence of a unified round hole in the country ended the previous situation of different monetary forms. In the Song Dynasty, the earliest paper money-Jiaozi appeared in the history of China and the world. As we all know, the Song Dynasty was one of the most developed dynasties in China's commodity economy. The developed economy led to a shortage of copper for coinage, so paper money came into being! In addition, there were also silver coins in the Yuan Dynasty, while most of them were copper coins in the Qing Dynasty. But we have also seen in TV series that the most peer currency is gold and silver! What currency is more enjoyable than Jin Yuanbao?