Which ancient civilization first implemented a standardized retail pricing system, where goods had fixed prices rather than being exclusively bartered or negotiated?

Before modern shopping malls and e-commerce, ancient civilizations had sophisticated trading systems and marketplaces that laid the foundation for today's retail concepts. From the agoras of Ancient Greece to the grand bazaars of Mesopotamia, retail innovation has deep historical roots. Test your knowledge about how our ancestors approached commerce, trade, and customer experience in the cradle of civilization!

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Ancient Rome with their 'mercatus publicus' system
Ancient Egypt with their 'shenat' marketplace approach
Mesopotamian Babylonians with their 'kārum' trading posts
Ancient China during the Zhou Dynasty with 'shi' markets