Which ancient civilization pioneered the first known customer feedback system in retail, where merchants provided clay tokens to repeat customers that could be redeemed for preferential treatment?

While modern retail focuses on customer experience optimization, ancient civilizations had their own sophisticated approaches to commerce and customer satisfaction. The agoras of Greece, Roman forums, and Eastern bazaars all featured customer experience innovations that would be familiar to today's retail strategists. This trivia question explores how ancient merchants created memorable shopping experiences and built customer loyalty thousands of years before modern CX strategies emerged.

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Mesopotamian traders in Babylon (c. 1800 BCE)
Egyptian market vendors in Alexandria (c. 300 BCE)
Chinese silk merchants along the early Silk Road (c. 100 CE)
Phoenician purple dye sellers in Tyre (c. 900 BCE)