Han inherited the Qin system and still used the gold and copper standard system. Gold is converted into gold, which is worth about 10 thousand copper coins. From Emperor Gaozu to Emperor Wudi of the Han Dynasty, the currency system was changed nine times, and only half-two, three-baht and five-baht coins were implemented.
Five baht coins have been in circulation for more than 700 years, that is, from the fifth year of Emperor founding ceremony of the Han Dynasty (1 18 BC) to the fourth year of Wude in Tang Gaozu (62 1 year AD), which can be described as the longevity coins in the square hole coins. The reason is that the five-baht coins are suitable in size and weight, and the money is beautiful, which is very popular among the people.
Emperor Wu of the Han Dynasty also cast large silver-tin alloy round dragon coins (worth 3,000 yuan), square Malaysian coins (worth 500 yuan) and oval turtle coins (worth 300 yuan). Because these coins are unknown in historical books, they have been controversial all the time. In recent years, several batches have been unearthed in Shaanxi, Gansu, Anhui and other places, and the number is also quite large. Studies have proved that these considerable unearthed objects, in terms of shape, weight and texture, are consistent with the dragon and horse turtles described in historical books, so it can be seen that they are three platinum products cast by Emperor Wu of the Han Dynasty-dragon coins, horse coins and turtle coins.
Wang Mang was in power for fifteen years, and carried out four monetary reforms, casting six springs, ten cloth, twenty-eight articles and thirty-six, which led to the confusion of monetary law, economic exhaustion, and people's complaints, and finally ended in failure. However, Wang Mang's coinage style is unique and novel, and his money is very beautiful in Wen Juan and world-famous. Therefore, Wang Mang was ridiculed by later generations as a sage who made money.