Which ancient civilization first established a standardized currency system specifically designed to improve the customer shopping experience in marketplaces around 600 BCE?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated marketplaces and trading systems. The earliest retail pioneers established practices that would influence commerce for millennia to come. This trivia challenges you to identify which ancient civilization pioneered one of history's most innovative retail customer experiences - a development that transformed how merchants and customers interacted across the ancient world.

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Lydians (in modern-day Turkey)
Ancient Egyptians
Mesopotamians
Indus Valley Civilization