Which ancient civilization pioneered one of the earliest known 'recommendation systems' where merchants were trained to suggest complementary products based on initial purchases?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's commerce. From Sumerian marketplaces to Roman shopping complexes, early merchants pioneered techniques still used in modern retail. This trivia question explores how ancient civilizations approached product recommendations and consumer behavior in ways that might surprise modern marketers.

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Ancient Rome, where 'institores' (retail managers) were taught to suggest complementary goods to increase transaction value
Ancient Egypt, where papyrus records show pharaonic decrees requiring merchants to offer alternatives when primary goods were unavailable
Phoenician traders, who developed 'purchase scrolls' tracking past customer preferences to recommend new products during return visits
Ancient Greece, where agora merchants implemented 'symposium selling' - showcasing complementary products together in curated displays