Which ancient civilization first developed the concept of a standardized 'shopping mall' with multiple specialized vendors in a single covered structure?

The ancient world was filled with remarkable retail innovations that shaped commerce for millennia. From sophisticated trade networks in Mesopotamia to standardized coinage in Lydia, ancient civilizations developed numerous retail concepts we still use today. This poll tests your knowledge about one of the most significant retail innovations that revolutionized the ancient marketplace and continues to influence modern shopping experiences.

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Roman Empire (Trajan's Market, 110 CE)
Ancient Greece (The Agora of Athens, 500 BCE)
Babylonian Empire (Esagila Market, 600 BCE)
Han Dynasty China (Imperial Bazaar, 100 BCE)