In Ancient Rome, what special retail innovation was introduced in the Trajan's Market, often considered the world's first shopping mall?

While we often think of ancient civilizations in terms of monuments and battles, their retail and trading systems were remarkably sophisticated. From the grand bazaars of Babylon to the merchant guilds of Rome, retail history offers fascinating insights into how ancient societies functioned economically. Test your knowledge about these early retail operations that laid the foundation for modern commerce!

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Multi-level shopping complex with over 150 shops organized by product categories
Underwater marketplace where merchants sold goods from boats through special waterproof containers
Rotating seasonal marketplace that changed location within the city every three months
24-hour shopping center with oil lamps that allowed nighttime retail operations