Which ancient civilization invented the first known standardized currency specifically designed for retail transactions, featuring uniform metal coins with consistent weight and purity?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that shaped commerce for millennia. From Mesopotamian bazaars to Roman shopping complexes, these early retail innovations laid the groundwork for how we buy and sell today. Test your knowledge about the fascinating retail practices that emerged in the cradle of civilization!

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Lydians (7th century BCE)
Egyptians (3rd millennium BCE)
Sumerians (4th millennium BCE)
Indus Valley civilization (2600 BCE)