#44 1370 · Ming Dynasty (Hongwu Emperor) · Government logistics and financesell-the-byproduct
The Ming government paid grain merchants in salt licenses instead of cash, and some just moved to the frontier
the problem
Hauling grain to frontier garrisons by state transport was ruinously expensive
background
Defending the early Ming dynasty's northern frontier against Mongol raids meant keeping tens of thousands of soldiers fed in garrisons hundreds of miles from China's farmland. Hauling grain that far overland by state corvée labor cost several times the grain's own value — a drain the young dynasty's treasury could not sustain indefinitely, and no amount of tighter transport administration was going to fix the basic arithmetic of distance.
In 1370, the court found a currency it could print for free: its own salt monopoly. Merchants who delivered grain to a frontier garrison received 盐引, certificates redeemable for a fixed allotment of state salt, which they could then sell at a market price that salt's guaranteed demand kept reliably profitable. The state paid nothing in cash — it let merchants convert a logistics service into an entirely different asset, a license to trade a good the government already controlled. Some merchants pushed the logic further still, settling laborers directly on frontier land to grow grain in place rather than transport it at all.
the move
Rather than pay merchants cash to haul grain to the northern frontier — cash the young dynasty didn't have to spare, over transport routes the state itself struggled to run efficiently — the Ming court paid in 盐引 (yanyin): certificates entitling the bearer to buy and resell state-monopoly salt, a good with guaranteed demand and value. A merchant who delivered grain to a garrison received a certificate redeemable for a profitable salt allotment; some merchants realized it was cheaper to skip the hauling altogether and settle laborers on frontier land to grow the grain on-site, founding merchant colonies (商屯) that supplied garrisons directly.
the payoff
The system, established in 1370 and formalized with fixed exchange rates the following year, funded frontier logistics for over a century without the state spending cash, and made early fortunes for merchant families — Shanxi traders prominent among them. It was substantially undercut in 1492, when official Ye Qi let merchants buy salt certificates with silver directly instead of delivering grain — simpler for the treasury to administer, but it gutted the incentive for frontier farming and let the certificate market decay into speculation over the following century.
what came after
Kaizhongfa financed the Ming frontier for over a century and helped seed the fortunes of merchant families, Shanxi traders among them, whose descendants' banking houses centuries later would include names like Rishengchang. Economic historians now read the salt-certificate market it created as an early, informal instrument resembling public debt.
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references
- [1]開中法Wikipedia, 2026zh.wikipedia.org
- [2]The Rise and Fall of a Public Debt Market in 16th-Century China: The Story of the Ming Salt CertificateChinese University of Hong Kong, Department of History, 2016history.cuhk.edu.hk