Material 1 In the first year of Qianyuan (758), salt-iron money was cast, which made Wuqi change the salt method for the first time. He built a salt courtyard in a convenient place with mountains, sea

Material 1 In the first year of Qianyuan (758), salt-iron money was cast, which made Wuqi change the salt method for the first time. He built a salt courtyard in a convenient place with mountains, seas, wells and stoves. Those who work in the salt industry are pavilion households and are exempted from the tax.

(1) Differences: Fifth Qi: government-run monopoly, government patent; forced price increase. Liu Yan: The official supervised the commercial sales of civilian products, and divided the profits between officials and merchants; Changping Salt was established.

(2) Promote the development of the salt industry; increase government fiscal revenue; benefit business and facilitate the people; and contribute to social stability.