Which ancient retail innovation, developed around 600 BCE, revolutionized commerce by introducing standardized value tokens that replaced direct barter systems?

Long before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's commercial practices. From Mesopotamia's clay tablet receipts to Rome's multi-story shopping complexes, retail innovation has a history spanning thousands of years. This trivia question explores one of the most significant retail technology advancements from the ancient world that revolutionized commerce and still influences modern transaction systems.

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Lydian electrum coins - the world's first standardized currency
Egyptian papyrus receipts with hieroglyphic inventories
Phoenician merchant credit tablets with carved debt records
Sumerian clay ball containers with counting tokens