Which ancient civilization invented the first known formal customer feedback system in retail, using clay tokens that customers would deposit in containers to rate their shopping experience?

The ancient world saw the birth of organized commerce and retail systems that would influence trade for millennia to come. From the agoras of Greece to the forums of Rome and the grand bazaars of Mesopotamia, ancient civilizations developed sophisticated retail innovations that shaped how humans exchanged goods and services. This trivia question explores one of the earliest retail innovations that changed how merchants gathered customer feedback in the ancient world.

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Ancient Egyptians in their temple marketplaces (circa 1500 BCE)
Phoenician merchants in their Mediterranean trading posts (circa 1200 BCE)
Babylonians in their central bazaars (circa 1800 BCE)
Han Dynasty Chinese in their imperial markets (circa 200 BCE)