Which ancient civilization invented the first known form of customer feedback system where merchants would leave 'satisfaction tablets' for patrons to mark their opinions about products?

Step back in time to explore the fascinating world of ancient commerce and product exchange! Long before modern shopping malls and online stores, ancient civilizations developed sophisticated systems for trading goods, gathering customer feedback, and marketing their wares. This poll explores how some of the earliest forms of retail and market research shaped commerce in the ancient world and laid the foundation for business practices we still use today.

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Mesopotamians, who used clay tablets at market entrances where customers could press positive or negative symbols
Ancient Egyptians, who employed scribes to record verbal feedback at the exits of bazaars
Romans, who introduced 'tabula satisfactionem' for citizens to rate public market vendors
Ancient Chinese merchants of the Han Dynasty, who used bamboo slips for customer comments