Diocletian · year 301
The Edict on Maximum Prices
The recipe, in one line: if prices rise, ban them from rising.
The Roman Empire had debased its currency again and again throughout the third century. The emperor's response wasn't to curb the money supply, but to set price caps on more than a thousand goods, wages, and freight — enforced with severe penalties, including death.
Irony: the government had debased the currency, then punished merchants because prices had gone up.

