Which ancient civilization first introduced standardized retail pricing rather than haggling, creating an early 'fixed-price' point of sale system in their marketplaces?

Long before digital payment systems and modern storefronts, ancient civilizations developed sophisticated methods of commerce and retail. From Mesopotamian clay tablets recording transactions to elaborate Roman market systems, the foundations of modern retail were established thousands of years ago. This trivia question explores how ancient civilizations approached an essential aspect of the retail customer journey that we still use today, albeit in more advanced forms.

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Ancient Egyptians, who established uniform grain prices enforced by royal decree
Ancient Romans, who instituted the 'Edictum de Pretiis' (Price Edict) under Emperor Diocletian
Phoenicians, who used standardized silver weights to create consistent pricing for their trade goods
Ancient Chinese during the Han Dynasty, who implemented government-regulated market prices