Which ancient civilization first implemented a standardized pricing system using marked clay tablets as 'price tags' for consistent retail pricing across multiple marketplaces?

Before modern shopping malls and e-commerce, ancient civilizations pioneered sophisticated retail systems. From the bustling agoras of Greece to the complex marketplaces of Mesopotamia, early civilizations developed remarkable retail innovations that laid the groundwork for today's commerce. This poll explores one fascinating aspect of ancient retail technology that revolutionized commerce in its time.

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Ancient Egypt, during the New Kingdom period (1550-1070 BCE)
Mesopotamian Babylonians, under King Hammurabi's reign (1792-1750 BCE)
Ancient Rome, during the early Republic era (500-300 BCE)
Han Dynasty China, under Emperor Wu's economic reforms (141-87 BCE)