Which ancient civilization invented the first standardized metal coins widely used in retail transactions, revolutionizing commerce by replacing barter systems?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that shaped commerce for millennia. From Mesopotamian market stalls to Roman shopping complexes, early retail innovations laid the groundwork for today's commercial landscape. Test your knowledge about these ancient retail pioneers who created the world's first marketplaces, payment systems, and commercial regulations.

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Lydians (modern Turkey) in the 7th century BCE
Egyptians during the New Kingdom period (1550-1070 BCE)
Sumerians in Mesopotamia around 3000 BCE
Indus Valley civilization around 2500 BCE