Which ancient civilization first developed a standardized retail point-of-sale system that included receipts written on clay tablets?

The ancient world had sophisticated commerce systems that laid the foundations for modern retail. From the agoras of Greece to the forums of Rome and the bazaars of Mesopotamia, ancient civilizations developed complex product exchange networks. This poll explores how these early civilizations innovated in product design and commerce platforms that would shape trading for millennia to come.

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Mesopotamians (specifically Babylonians)
Ancient Egyptians
Phoenicians
Ancient Greeks