Which ancient civilization pioneered the first known systematic customer feedback system for marketplace goods using colored tokens that buyers would deposit in containers to rate merchant quality?

Before modern survey tools and review platforms, ancient civilizations had their own innovative methods to gather customer feedback and improve their marketplace offerings. From Mesopotamian clay tablets to Roman forum announcements, the voice of the consumer has always mattered in commerce. Test your knowledge about one particularly fascinating customer feedback innovation from the ancient world!

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Ancient Egyptians, who used colored papyrus scrolls to rate Nile market vendors
Ancient Greeks, who implemented the 'ostraka' token system in the Agora marketplace of Athens
Phoenicians, who used shell fragments marked with symbols to evaluate imported goods
Babylonians, who maintained clay tablet registers where customers could mark symbols rating merchant honesty