Which ancient civilization first implemented formal market segmentation by dividing their central marketplace (agora) into specialized sections for different product categories?

Long before Amazon and Alibaba, ancient civilizations created sophisticated commercial systems that revolutionized how goods were traded. These early marketplaces implemented innovations in retail that would echo through millennia of commerce. This trivia question explores how ancient civilizations approached market segmentation - a concept we consider modern but has roots dating back thousands of years.

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Ancient Greece (5th century BCE)
Ancient Egypt (New Kingdom period)
Mesopotamia (Babylonian era)
Ancient Rome (Republican period)