Which ancient civilization is credited with inventing the first known form of commercial advertising, where merchants painted product advertisements on walls to attract customers?

Before modern e-commerce and shopping malls, ancient civilizations created sophisticated commercial systems that laid the foundation for today's retail world. From Mesopotamian bazaars to Roman shopping complexes, product distribution and exchange have been central to human civilization for millennia. This trivia question explores how ancient peoples advertised their goods - a fascinating glimpse into early product marketing techniques that would eventually evolve into today's sophisticated advertising landscape.

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Ancient Romans in Pompeii
Babylonians in Mesopotamia
Ancient Egyptians along the Nile
Phoenician traders in their Mediterranean ports