Innovation & Wealth › Ancient merchants & trade › Roman denarius and Mediterranean commerce
Diocletian's Edict on Maximum Prices
AD 301· Law or policy· Laws, labor & antitrust
Well documentedSolid records, texts or physical evidence.
A Roman law setting maximum prices for over 1,000 goods, services and wages, under penalty of death.
See it on the Innovation & Wealth map →What happened
Decades of coin debasement had driven prices sharply higher. In AD 301 Emperor Diocletian, blaming greedy merchants, especially those overcharging soldiers, set ceilings on everything from wheat and pork to shoes, freight charges and teachers' fees. Selling above the limit could mean death. The Christian writer Lactantius, hostile to Diocletian, says goods vanished from markets and the law was soon dropped. Inflation continued.
Impact on society and the economy
It is history's best-known price-control failure: capping prices did not cure inflation caused by debased money, a lesson cited ever since.
How we know
Dozens of inscribed fragments in Latin and Greek, found mostly in Greece and Turkey, preserve much of the price list. Lactantius's account dates from about AD 315.
Still debated
How widely and how long it was enforced is unclear; few copies come from the western empire, and Lactantius may exaggerate the failure.
Connections (2)
▸Diocletian's Edict on Maximum Prices echoed the fixed wages and fees of Code of Hammurabi's rules on loans and tradeMostly agreed
The connection
About 2,000 years apart, both rulers tried to set economic values by decree: Hammurabi fixed wages and hire fees for laborers, oxen and boats, and Diocletian capped prices and wages across his empire. There was no direct borrowing; it is a recurring idea, not a lineage.
When and how
Babylon, about 1754 BC, and the Roman Empire, AD 301.
How sure are we?
Both texts survive, so the parallel is clear. No evidence suggests Diocletian's officials knew Hammurabi's laws; by then cuneiform was a dead script.
Debates
Whether either set of fixed rates worked as real ceilings or only as reference points is debated.
▸Diocletian's Edict on Maximum Prices tried to halt inflation in Roman denarius and Mediterranean commerceWell documented
The connection
Third-century emperors paid soldiers by debasing the silver coinage, and prices rose many times over. Diocletian reformed the coins, then in 301 imposed maximum prices across the empire. Merchants withheld goods rather than sell at a loss, and inflation continued after the edict was abandoned.
When and how
Throughout the Roman Empire, AD 301, under Emperor Diocletian and his co-emperors.
How we know
The edict's own preamble blames profiteers and cites soldiers' pay; papyri from Egypt show prices continuing to rise afterward.
Debates
Whether the edict failed quickly everywhere, as Lactantius claims, or was partly observed for a time is debated.