Which ancient civilization pioneered the first known standardized 'point of sale' system with uniform weights, measures, and written receipts for retail transactions?

While we often think of retail as a modern concept, ancient civilizations developed sophisticated commercial systems that mirror many aspects of today's retail landscape. From the bustling agoras of Greece to the complex Roman market networks, our commercial practices have deep historical roots. This poll explores how ancient civilizations pioneered retail concepts that we still use today in our digital transformation journey.

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Ancient Egypt, where temple administrators created receipts on papyrus for grain and goods exchanges around 3000 BCE
Mesopotamia, where Sumerian merchants used clay tablets with cuneiform script to record transactions and provide 'receipts' around 3500 BCE
Ancient China, where merchants during the Shang Dynasty (1600-1046 BCE) used oracle bones to record sales and inventory
The Indus Valley Civilization, where merchants used standardized weights and seals as transaction receipts around 2600 BCE