Economy of the Han dynasty
The population of the Han Empire, recorded in the tax census of 2 AD, was 57. 6 million people in 12,366,470 households. The use of a standardized, nationwide currency during the Qin dynasty facilitated long-distance trade between cities. The first coin minted in 186 BC was a bronze coins weighing 5.7g, and issued by Empress Lü Zhihi.