Which ancient civilization first introduced a standardized retail currency system with quality control markings that revolutionized marketplace transactions around 600 BCE?

Before modern retail giants and e-commerce platforms, ancient civilizations had their own sophisticated marketplaces and trade systems. From the agoras of ancient Greece to the bazaars of Mesopotamia, retail history stretches back millennia. This poll explores a fascinating innovation from ancient retail that transformed commerce and influenced trading systems for centuries to come.

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Lydians (in modern-day Turkey) who created the first official gold and silver coins with consistent purity and weight
Egyptians who implemented a standardized grain-based exchange system with official seals of purity
Phoenicians who developed trade tokens marked with royal insignias guaranteeing value across Mediterranean markets
Chinese Zhou Dynasty that introduced standardized bronze spade and knife money with quality certification marks