Which ancient civilization created the first known retail payment system using clay tokens called 'bullae' that functioned similarly to modern receipts?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems and marketplaces that laid the foundation for today's commercial world. Many retail concepts we consider modern actually have roots dating back thousands of years. Test your knowledge about the fascinating retail innovations from the ancient world that continue to influence how we buy and sell goods today.

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Ancient Mesopotamia (3500 BCE)
Ancient Egypt (2500 BCE)
Ancient China (1200 BCE)
Ancient Greece (800 BCE)