Huizi (currency)
The Huizi (), issued in the year 1160, was the official banknote of the Chinese Southern Song dynasty. It has the highest amount of issuance among various banknote types during the Song dynasty. Huizi notes came on three-colour printed paper and their usage was heavily promoted by the government of the Southern Song dynasty, the Huizi were backed by 280,000 "guàn" of copper cash coins. History. The Huizi was originally introduced in the region of Liangzhe (兩浙) around what is present-day Zhejiang, and after 1160 Huizi notes were issued by the Ministry of Revenue (戶部) and their  circulation was overseen by the Paper Notes Office (會子務). The earliest mentions of Huizi banknotes can be traced back to Shaanxi in 1075. In Hangzhou and the areas around it "bianqian huizi" (便錢會子) or "comfortable money" had become a common form of exchange during the beginning of the Southern Song dynasty. Besides the Jiaozi, Qianyin, and Guanzi the Huizi had become the most important form of paper currency during the Southern Song dynasty and was used for daily business transactions as well as for tax collecting and the usage of Huizi banknotes had also spread to the western and northern  areas of the empire. Between the years of 1161 and 1166 the government of the Song dynasty had produced 28,000,000 "dào" (道, equal to a "guàn" or 1000 "wén") in Huizi notes. During the reign of Emperor Xiaozong the usage of paper money came into question but as there was a shortage of copper cash coins they were assessed to be needed for the economy to be maintained as the amount of coins in circulation didn't sufficiently meet the markers demands, at this time there were Huizi banknotes with denominations as high as 4,900,000 "guàn" in daily circulation. In  reaction to this Emperor Xiaozong regularly renewed the Huizi in circulation but not all expired Huizi notes were destroyed as they often kept circulated at lower values which caused the number of Huizi in circulation to rise. The Huizi notes were set to expire 3 years after their introduction and could be exchanged for their nominal value in copper cash coins, but in reality they were only produced every 9 years and 20,000,000 "guàn" in newly printed notes were added to the market, in 1195 this was raised to 30,000,000 "guàn". As Huizi notes were easily forged the currency became  deprecated to the point that a banknote of 200 "wén" couldn't buy a single straw sandal anymore near the end of the dynasty. The value of the Huizi had lowered so much that a "guàn" was only accepted at between 300 and 400 cash coins, which caused people to start hoarding these coins and remove them from circulation which had a devastating effect on the economy. As the Mongols continued marching south the Chinese military required more money causing the government to print an excessive amount of Huizi banknotes. Denominations. The first Huizi note had a nominal value of  1 "guàn", but subsequently banknotes of 200 "wén", 300 "wén", and 500 "wén" were introduced in 1163. Regional variants. Other than the Huizi issued by the central government regional varieties existed such as get Hubei Huizi (湖北會子) which was produced in a volume of 7,000,000 "mín" but only came in the denominations 500 "mín" and 1000 "mín", the Iron-cash Huizi (鐵錢會子) came in denominations of 100 "wén", 200 "wén", and 300 "wén" and circulated only in Jinyang, the Silver Huizi (銀會子) of Sichuan was introduced in 1137 and was denominated in 1 "qián" and 1.5 "qián". Other variants include  the Zhibian Huizi (直便會子) and the Huguang Huizi (湖廣會子).