Which ancient civilization first implemented a standardized 'point of sale' system using clay tokens that represented specific goods for transaction recording?

The ancient world was home to sophisticated commercial systems long before modern retail. From Mesopotamian clay tablets tracking inventory to Roman shopping complexes, ancient civilizations developed innovative solutions for commerce that laid the foundation for today's retail practices. Test your knowledge about these early retail innovations that shaped how humans have bought and sold goods for millennia.

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Mesopotamian (Sumerian) merchants around 3500 BCE
Egyptian traders during the New Kingdom period (1550-1070 BCE)
Phoenician marketplace vendors in the 9th century BCE
Greek agora merchants during the Golden Age of Athens (5th century BCE)