Why was there so little money in the Ming Dynasty?

The casting of copper coins in Ming Dynasty can be divided into three stages. From Hongwu, Ming Taizu to Qin Long, Ming Muzong experienced twelve emperors, only six of whom made money, and all of them were very limited. Ming Shenzong has minted a large number of coins since Wanli. Until the Chongzhen period of the Ming Dynasty, the situation was getting worse and worse because of excessive coinage and complicated money system. In July of the 26th year of Hongwu, only Shi Jing Baoyuan Bureau was allowed to cast money, and other provinces stopped casting money. In August, because the circulation of valuable paper money was blocked, in order to resolutely implement the paper money system, the use of copper coins was banned again. It lasted for forty-one years until the reign of Emperor Xuanzong of the Tang Dynasty in the Ming Dynasty. During the Hongwu period of the Ming Dynasty, except for a few provinces, there were no coin burners in all provinces. From the ninth year of Xuande to the sixteenth year of Hongzhi of Emperor Xiaozong of Ming Dynasty (AD 1503), * * * did not cast any more money in 68 years. During the years of Xiao Zhong and Hongzhi, the credit of paper money was shaken, people refused to use it, and even bartered things. Three pence can't get back ten precious yarns. The Ming government believed that if the copper coins were not reissued, it would be impossible to recover the credit of Baosha, and many benefits were also earned by private foundries, so it ordered two provinces in Beijing and thirteen provinces to reopen the furnace to cast money. Casting "Hongzhi Bao Tong", this money is all small money. There is no text behind, just look at the real one. There are many versions of this money, which are different from place to place. There is a "Hongzhi Bao Tong" handed down from generation to generation, who is an orphan. Hongzhi Bao Tong rose from one dollar to one dollar and two cents. Hongzhiqian's calligraphy is relatively ordinary, and the amount of casting is not much, which can't meet the required quantity, because Xiaozong was dead when he changed money and recast new money, and money was stopped when Mingwuzong succeeded to the throne and changed his name.