Which ancient civilization pioneered the concept of dedicated retail districts with specialized shops organized by product category, essentially creating the world's first 'shopping malls'?

Long before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's consumer experiences. From specialized market districts to early branding techniques, these innovations shaped how products moved from producers to consumers. This trivia question explores how ancient merchants created customer experiences and retail environments that would be recognizable even to today's retail strategists.

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Ancient Rome (with their multi-story shopping complex called Trajan's Market)
Ancient Egypt (with their royal market halls along the Nile)
Mesopotamia (with their zigzurat marketplace complexes)
Ancient China (with their Tang dynasty commercial quarters)