Which retail innovation did ancient Roman merchants develop that is considered a predecessor to modern store window displays?

The marketplaces of ancient civilizations were more sophisticated than many realize. From specialized retail spaces to innovative product displays, ancient merchants developed remarkable systems to attract customers and manage their inventory. This trivia question explores a fascinating retail innovation that emerged in ancient Rome and revolutionized how goods were presented to consumers.

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Tabernae windows - street-facing open arches with goods displayed on marble counters visible to passersby
Forum catalogs - illustrated papyrus scrolls showing available merchandise that customers could browse before entering shops
Mercatus towers - elevated platforms where merchants would demonstrate their premium goods to crowds below
Negotiator tablets - wax tablets with product information and pricing that customers could take home