Which ancient civilization first implemented a standardized pricing strategy where merchants were required by law to display fixed prices on their goods rather than negotiating each sale?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that formed the backbone of their economies. From the agoras of Greece to the bazaars of Mesopotamia, retail innovation shaped how goods were traded and valued. This trivia question explores one fascinating aspect of ancient retail strategy that might surprise even those familiar with historical commerce practices.

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Roman Empire under Emperor Diocletian's Price Edict of 301 CE
Babylonian Kingdom under Hammurabi's Code in 1754 BCE
Egyptian New Kingdom during Ramesses II's reign around 1250 BCE
Han Dynasty China during Emperor Wu's economic reforms around 120 BCE