Which ancient civilization invented the first known standardized system of weights and measures for retail trade, revolutionizing their point-of-sale accuracy around 2600 BCE?

Before modern shopping malls and e-commerce, ancient civilizations had sophisticated retail systems that laid the foundation for today's commercial practices. Their innovations in marketplace design, trade regulations, and consumer experiences were remarkably advanced for their time. This trivia question explores how ancient retail pioneers developed point-of-sale systems that influenced commerce for millennia to come.

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Indus Valley Civilization (Harappa and Mohenjo-daro)
Ancient Egyptians under Pharaoh Khufu
Mesopotamian Akkadian Empire
Early Chinese Xia Dynasty