Which ancient civilization created the first documented customer loyalty program, where merchants gave clay tokens to repeat customers that could be exchanged for merchandise discounts?

Ancient civilizations weren't just building monuments and waging wars—they were also developing sophisticated commercial systems! Some of their retail innovations were surprisingly advanced and continue to influence modern business practices. This trivia question explores how ancient merchants maintained customer loyalty thousands of years before modern reward cards and digital points systems existed.

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Ancient Egypt (around 1300 BCE)
Ancient Rome (around 100 CE)
Ancient Babylon (around 1800 BCE)
Ancient Greece (around 500 BCE)