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Why did Emperor Wudi create state monopolies on salt and iron?

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Map showing the Han Empire's territory around 100 BCE, shaded in orange, covering much of eastern China and extending westward. The map also marks the boundary of modern China and highlights the Great Wall running along the northern frontier, built for protection against the Huns. Major rivers and the capital, Chang'an (Xi'an), are labeled. — Han dynasty Map showing the extent of the Han empire c. 100 bce.

Emperor Wudi of the Han dynasty established state monopolies on salt and iron primarily to address the severe financial strain caused by his ambitious military campaigns and other expansive state undertakings.12

By the late 130s BCE, Wudi had shifted away from the defensive foreign policies of his predecessors, committing the empire to aggressive territorial expansion and frequent warfare against the Xiongnu and other groups. These constant military efforts, along with the emperor's costly construction projects and search for immortality, exhausted the state’s financial reserves.1

To secure necessary revenue, the government instituted these monopolies around 117 BCE, creating agencies to supervise the mining, manufacturing, and distribution of salt and iron. Beyond raising funds, these measures were part of a broader effort to bring China’s essential resources under direct imperial control. While these policies provided the state with income, they were controversial and faced criticism regarding both their principle and practical utility, eventually leading to the industries reverting to private hands by the mid-1st century CE.2