Which ancient civilization pioneered an early retail recommendation system where merchants were trained to observe customers' clothing quality and jewelry to recommend appropriate products at suitable price points?

The ancient world had sophisticated retail systems long before modern technology. From Mesopotamian market stalls to Roman shopping complexes, civilizations developed intricate methods for product recommendation and customer engagement. This trivia explores how ancient merchants implemented early versions of retail recommendation systems to increase sales and customer satisfaction in their bustling marketplaces.

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Ancient Romans with their 'tabernae' shop system
Phoenician merchants with their 'compatible goods' display technique
Egyptian bazaar sellers with their 'royal worthiness' assessment
Chinese Han Dynasty merchants with their 'social rank' classification