Which ancient civilization created the world's first known standardized retail pricing system, using fixed price tags instead of haggling?

Before modern e-commerce and shopping malls, ancient civilizations pioneered sophisticated retail systems that revolutionized how humans traded goods. From Mesopotamian marketplaces to Roman shopping complexes, retail innovation has deep historical roots. This trivia explores one of the most significant ancient retail innovations that shaped commerce for centuries to come and continues to influence modern retail principles.

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Ancient Rome with their 'Tabernae' shops and the 'Mercatus' system
Ancient Egypt under Pharaoh Ptolemy I, who introduced the 'seshat' price markers
The Phoenicians with their 'shekel-marked' merchandise in Mediterranean trade
Mesopotamian Babylonians under King Hammurabi's market reforms