How heavy iron cash shaped payments in Song-era Sichuan, and how merchant receipts preceded the government's Jiaozi issues.
In Song-era Sichuan, iron cash coins were widely used, and their weight made large payments inconvenient. That practical pressure helped merchants develop receipts and credit instruments that could stand in for coins during settlement.
Iron was heavy and cheap. Large purchases could require thousands of coins, creating a transport problem for merchants who had to move cash between markets.
Government Jiaozi issues (1023 CE)
Early jiaozi developed from deposit receipts and merchant credit in Chengdu. Later government issues formalised the system.
Instead of retrieving heavy coins for every payment, traders could use receipts and credit instruments to settle debts. Jiaozi is an important early example of paper money and a useful case study in how payment instruments can grow from commercial practice.
State Takeover & Anti-Counterfeiting Mints
Private merchant issues came first. In 1023, the Northern Song government took over issuance and administration of Jiaozi through an office in Sichuan. This was a change in who issued the notes, not the invention of paper money itself.
- The cited accounts distinguish earlier merchant-issued notes from the later government issue.
- Jiaozi circulated in the iron-money region of Sichuan.
Marco Polo's later account concerned paper currency under the Yuan ruler Kublai Khan, not Song Jiaozi. The example is useful for the longer history of Chinese paper money, but it should not be treated as a direct description of this earlier Sichuan system.
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Sources & References
- American Numismatic Association Money Museum: An Experiment in Paper Virtual Money — Sichuan promissory notes, heavy coins, Jiaozi, and the government's takeover.
- National Museum of China: Huizi edition — the Northern Song Sichuan iron-money region and early Jiaozi paper money.
- Chinese Text Project: Shu Zhong Guang Ji, chapter 67 — historical account of private Jiaozi and the establishment of the Yizhou Jiaozi Office.