Which ancient civilization first used a standardized system of weights and measures for marketplace transactions that included official inspectors to verify merchant scales?

Before modern retail and e-commerce, ancient civilizations developed sophisticated systems for commerce and trade. Their methods of tracking goods, managing transactions, and building customer loyalty laid the groundwork for today's retail practices. This poll tests your knowledge about the point-of-sale systems used in ancient marketplaces and how they compared across different civilizations.

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Mesopotamia (specifically during the Third Dynasty of Ur, circa 2100 BCE)
Ancient Egypt during the New Kingdom period (1550-1070 BCE)
The Indus Valley Civilization (2600-1900 BCE)
Ancient Greece during the Athenian democracy (508-322 BCE)