Which retail innovation, first widely implemented in Lydia (modern Turkey) around 600 BCE, revolutionized commerce by standardizing exchange values and eliminating the need for barter in ancient marketplaces?

Before modern shopping centers and e-commerce, ancient civilizations developed sophisticated retail systems that would lay the groundwork for commerce as we know it today. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, retail strategies have evolved over millennia. This trivia question explores an innovative retail technology that revolutionized commerce in the ancient world and continues to influence modern retail practices.

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Standardized coinage (electrum coins)
Clay tablet receipts with merchant seals
Weight-based precious metal exchange systems
Token-based credit accounts for regular customers