Which ancient civilization created the first known permanent retail marketplace with standardized weights and measures for fair trade?

While modern retail involves digital analytics and complex point-of-sale systems, ancient civilizations pioneered the very concept of marketplaces and retail strategies. These early commercial centers weren't just places of trade but sophisticated operations with inventory management systems, customer retention practices, and even early forms of market segmentation. Test your knowledge about the retail strategies of our ancient predecessors with this challenging question!

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Ancient Mesopotamia (The Sumerians, circa 3000 BCE)
Ancient Egypt (During the Old Kingdom, circa 2600 BCE)
Indus Valley Civilization (Harappa and Mohenjo-daro, circa 2500 BCE)
Ancient China (Shang Dynasty, circa 1600 BCE)