Which architectural retail innovation did the Ancient Romans introduce in their macellum (marketplace) design that is still used in modern shopping centers?

The ancient world featured sophisticated retail systems long before modern commerce. From Mesopotamian bazaars to Roman shopping complexes, ancient civilizations developed innovative store layouts and customer experiences that sometimes mirror modern retail principles. This poll tests your knowledge about an interesting retail innovation from ancient Rome that influenced store design for centuries to come.

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Central courtyard surrounded by specialized vendor stalls arranged by product category
Movable display shelves that could be rearranged daily based on popular items
Digital price markers made from wax tablets that were updated twice daily
Customer loyalty system using clay tokens stamped with merchant symbols