Which ancient civilization introduced the world's first standardized retail pricing system using government price controls?

The ancient world featured sophisticated marketplaces and trading systems that laid the groundwork for modern retail. From the Agoras of Greece to the Forum of Rome and the bazaars of Mesopotamia, early civilizations developed remarkable retail innovations that shaped commerce for millennia. This poll tests your knowledge about these ancient retail innovations and how they influenced consumer behavior across early human societies.

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Ancient Egypt under Pharaoh Ptolemy IV, who established fixed prices for grain and textiles in royal marketplaces
The Roman Empire under Emperor Diocletian, who implemented the Edict on Maximum Prices to combat inflation
Babylonia under King Hammurabi, whose code included fixed pricing for common marketplace goods
Ancient China during the Han Dynasty, which established imperial price controls on silk and salt trade