Which ancient civilization invented the world's first standardized retail pricing system with fixed prices marked on goods, eliminating the need for haggling?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail strategies. From the bustling agoras of Ancient Greece to the organized markets of Rome and the trade routes of Mesopotamia, retail has ancient roots. This trivia question explores a fascinating case study of an innovative ancient retail strategy that changed how commerce functioned in its time.

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Ancient Rome with their 'pretium iustum' (just price) system in urban marketplaces
Ancient Egypt, where merchants in the New Kingdom period (1550-1070 BCE) marked papyrus price tags on goods in royal marketplaces
Mesopotamian Babylonians, who used clay tablets as price markers in the central bazaars
Ancient China during the Han Dynasty, who implemented government-regulated price boards in city markets