Which retail innovation, first documented in ancient Mesopotamia around 3000 BCE, revolutionized commerce by allowing customers to browse merchandise on display rather than requesting items from merchants?

Before modern shopping malls and e-commerce, ancient civilizations created sophisticated marketplace systems that revolutionized commerce. Many retail concepts we consider modern actually have roots going back thousands of years! This trivia question explores how ancient Mesopotamians transformed early commerce with an innovation that became fundamental to retail history.

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The open marketplace with fixed stall layouts
The clay tablet loyalty program that offered discounts to returning customers
The seasonal sales event tied to religious festivals
The merchant guild system that standardized pricing across markets