Why didn't money circulate during the more than 300 years from the establishment to the demise of the Tang Dynasty? Please be familiar with Tang Shi's monetary scholars and experts to help me solve my doubts and give directions. The law of money in the Tang Dynasty was changeable. From the founding of the People's Republic of China to its demise, including the period of Emperor Taizong and Emperor Xuanzong of the Tang Dynasty, monetary policy has never been on the right track. The officially issued coins were either difficult to be widely implemented or stolen by a large number of people. In the former dynasty, there were five baht and all kinds of bad money, which brought a lot of trouble to the transaction. Therefore, barter often replaces currency exchange. Money doesn't circulate.