Which advertising technique was commonly used by merchants in Ancient Rome to promote their shops and products to potential customers?

Long before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems and marketing techniques. From the bustling agoras of Ancient Greece to the complex trade networks of Mesopotamia, these early societies pioneered retail concepts we still use today. This trivia question explores how ancient merchants advertised their products and built their brands in a world without digital technology.

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Painted wall signs (signa) with recognizable logos and imagery outside shops
Distributing clay tablets with product descriptions door-to-door to wealthy citizens
Hiring professional actors to perform product demonstrations in public forums
Publishing monthly product catalogs on papyrus for subscription delivery