Which ancient civilization invented the first known standardized retail weights and measures system that became the foundation for fair marketplace transactions?

Long before digital payments and modern retail stores, ancient civilizations developed sophisticated systems for trade, commerce, and retail transactions. These early innovations laid the groundwork for today's retail technology. This trivia question explores one of the earliest forms of point-of-sale systems used in the ancient world. Test your knowledge about how our ancestors conducted commercial transactions thousands of years ago!

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Ancient Egypt (using the 'deben' weight system for marketplace transactions)
Indus Valley Civilization (with their remarkably precise cubic stone weights)
Ancient Rome (with their standardized 'libra' weighing system)
Ancient Greece (using the 'obol' system for standardized marketplace exchanges)