Ten thousand copper = ten penetration (hanging) copper = twelve taels of silver = one tael of gold.
2. Nowadays, money has basic units such as "cents, cents, yuan and hundred", and ancient money also has basic units such as "Wen, Guan and Liang", that is, one currency and one system (that is, standard square hole copper coins), which has always been copper coins, one silver and one gold.
And "ingot" is not the basic unit of exchange, because "ingot" as a quantifier in ancient times, such as a silver ingot, means a piece of silver.
Extended data:
Ancient currency:
Ancient currency refers to the currency that is historical, valuable and exchangeable compared with modern currency. With the continuous development of society and the increase of surplus commodities, people gradually depend on each other, accept other commodities and need to export their surplus commodities. This is the earliest ancient currency as an intermediate medium.
The ancient system of weights and measures in China was extremely chaotic. There are differences between different dynasties, and there are also differences between different regions in the same dynasty.
China's ancient currency exchange system;
China's ancient monetary system, different from other countries, did not have any standard system, and there was no distinction between primary currency and secondary currency. Often, gold, silver, copper, grain, silk and later paper money all exercise the function of money at the same time to varying degrees, but they all have emphasis in different historical periods. The monetary systems of different dynasties were also very inconsistent. Even in different periods and regions of a dynasty, there are various changes and differences, and the narrative is endless.
Baidu Encyclopedia-Ancient Currency