During the reign of Emperor Wu of the Han Dynasty, due to the harassment of Xiongnu at the border of the Han Dynasty, Emperor Wu of the Han Dynasty deliberately expelled them by force. However, due to the lack of treasury in the imperial court, it was impossible to support such a war for a long time, so at the behest of Emperor Wu of the Han Dynasty, Zhang Tang, the ancient imperial physician at that time, put forward the suggestion that the imperial court should monopolize the iron and salt in the Han Dynasty. Hearing this, the Emperor Wu of the Han Dynasty agreed, so someone recommended the salt merchant Dongguo Xianyang and the iron merchant Kong You to the Emperor Wu of the Han Dynasty.
Although businessmen at that time were not allowed to be officials in North Korea, Emperor Wu of the Han Dynasty gave them special treatment in a special period, allowing them to take the upper position. Although everything is under the control of Emperor Wu of the Han Dynasty, there are still some loopholes in the policy, which makes Kong only exploit loopholes. So Sang Hongyang, who knows the art of making money best in history, appeared on the stage of history. Sang Hongyang was a financial genius since he was a child, so he was elected to the palace. After that, Sang Hongyang gradually clarified the disadvantages of the policies of the last generation in power.
He established a series of management systems from central to local by setting up some reasonable institutions, and on this basis, he also implemented some related economic measures. For example, he suggested that Liu Che take back all the coinage rights of fiefs, all of which are owned by the state, and then circulate them, so as to realize the central government's control over local financial rights. Under the governance of Sang Hongyang, the economy of the Han Dynasty became so powerful that it could support the military expenditure of Emperor Wu of the Han Dynasty to crusade against the Huns for years.