Yong-le: Year 19, Month 12, Day 13
6 Jan 1422
The Jiao-zhi Provincial Administration Commission advised: "The grain stores are insufficient. We should make use of the Liang-huai and Zhe-jiang official salt, and call merchants to provide grain to Jiao-zhi in exchange for the salt and pay them above-standard rates. Also, the practice of exchanging Jiao-zhi salt for gold is not a standard practice. The two types of salt should be used in exchange for grain. When sufficient grain has been obtained, this measure can be stopped." The memorial was sent to the Ministry of Revenue for discussion. At this time, the Minister Guo Zi and others proposed: "In the four prefectures of Jiao-zhou, Bei River, Liang River and Xin-an, one yin of salt should be exchanged for four dou of rice or one shi of paddy. In the two prefectures of Jian-ping and Qing-hua, one yin of salt should be exchanged for three dou five sheng of rice or eight dou seven sheng of paddy. In the two prefectures of Yi-an and Xin-ping, one yin of salt should be exchanged for three dou of rice or seven dou five sheng of paddy. In Shun-hua Prefecture, one yin of salt should be exchanged for two dou five sheng of rice or six dou two sheng of paddy." This was approved.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 14, page 2299