Which ancient civilization pioneered the first known form of 'point of sale' receipt system using clay tokens placed in sealed clay envelopes to record transactions?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated systems for trade and commerce. From Mesopotamian clay tablets recording transactions to Roman shopping complexes, the foundations of retail were established thousands of years ago. Test your knowledge about the retail technologies and practices that helped ancient merchants build commercial empires and shaped today's retail landscape.

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Mesopotamia (circa 8000-7500 BCE)
Ancient Egypt (circa 3000 BCE)
Indus Valley Civilization (circa 2600 BCE)
Ancient China (circa 1200 BCE)