Which ancient civilization is credited with inventing the world's first known retail pricing strategy called 'fixed price tags' to replace the traditional haggling system?

Before modern retail giants and digital storefronts, ancient civilizations developed sophisticated commercial systems. The agoras of Greece, forums of Rome, and bazaars of Mesopotamia were vibrant centers of trade with unique pricing strategies and merchandising techniques. Test your knowledge about the world's earliest retail innovations that set foundations for commerce practices we still use today.

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Ancient Rome under Emperor Diocletian
Ancient Egypt during the New Kingdom period
Ancient Greece in the Agora of Athens
Sumerian merchants in Mesopotamia