Which ancient civilization invented the first known system similar to modern 'receipts' for commercial transactions, using clay tokens sealed in clay envelopes around 3500 BCE?

Before modern retail stores and e-commerce, ancient civilizations developed sophisticated systems for trade, commerce, and product exchange. Their innovative approaches to marketplaces, merchandising, and commerce infrastructure laid the groundwork for today's retail experiences. Test your knowledge about the remarkable product innovation and 'point of sale' systems that existed thousands of years ago!

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Mesopotamians (Sumerians)
Ancient Egyptians
Indus Valley Civilization
Ancient Chinese