Which ancient civilization created the first known customer experience 'rating system' for merchants through publicly displayed clay tablets of customer feedback?

The ancient world had sophisticated commercial systems that laid the groundwork for modern retail. From Mesopotamian clay tablets recording transactions to Roman shopping complexes, these civilizations pioneered retail concepts we still use today. This trivia explores how ancient civilizations approached customer experience and commercial innovation in ways that might surprise you.

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Babylonians, who required merchants to maintain 'satisfaction tablets' where customers could record their experiences for others to read
Egyptians, who established papyrus scrolls at marketplace entrances listing 'trusted' and 'untrusted' vendors based on past transactions
Romans, who implemented a coin-based voting system at marketplaces allowing shoppers to rate vendor quality and honesty
Greeks, who created an amphora token exchange where satisfied customers would present merchants with tokens others could see when shopping