Which ancient civilization invented the first known standardized system of weights and measures for retail transactions, creating the world's first regulated point-of-sale system?

The ancient world had sophisticated retail systems long before modern commerce. From Mesopotamian market stalls to Roman shopping complexes, ancient civilizations developed innovative point-of-sale systems and retail techniques that would influence commerce for millennia. Some of these innovations were so effective that versions of them are still used today. Test your knowledge about one particularly groundbreaking ancient retail innovation!

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Mesopotamians (specifically the Sumerians around 3000 BCE)
Ancient Egyptians under Pharaoh Thutmose III
The Indus Valley Civilization at Mohenjo-daro
The Zhou Dynasty in ancient China