Which ancient civilization invented the world's first standardized retail currency system that featured government-certified coins of consistent weight and purity?

Before modern malls and e-commerce, ancient civilizations pioneered sophisticated retail systems that shaped how we buy and sell today. From Mesopotamian clay receipt tablets to Roman shopping complexes, these innovations laid the groundwork for modern commerce. Test your knowledge about one of history's most revolutionary retail developments that changed trade forever!

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The Lydians (modern Turkey) in 600 BCE, who created coins stamped with royal symbols as guarantees
Ancient Egypt, where pharaohs implemented gold-backed papyrus certificates for marketplace transactions
The Indus Valley Civilization, which developed the first merchant guild-approved clay coin tokens
The Phoenicians, who created a maritime trade network using standardized silver shekels with ship emblems