In ancient Roman cities, what specialized retail layout feature did they develop that revolutionized shopping and is still used in modern retail design?

Before shopping malls and e-commerce, ancient civilizations had sophisticated retail systems. From Mesopotamian bazaars to Roman commercial districts, the foundations of modern commerce began thousands of years ago. This trivia explores how ancient merchants structured their retail spaces for optimal customer experience and sales - proving that store layout strategies are as old as civilization itself.

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The macellum - covered market buildings with specialized vendor stalls arranged around a central courtyard
The emporium - floating markets on barges that would dock at different city sections on different days
The tabernae pyramidis - pyramid-shaped stores with luxury goods at the top and necessities at the base
The mercatus circularis - circular marketplaces where shoppers moved clockwise past vendor booths based on social class