Which ancient civilization created the first known standardized currency specifically designed to facilitate retail trade, revolutionizing how merchants displayed and priced their inventory?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems to distribute goods and services. From Mesopotamian bazaars to Roman macella (food markets), retail innovation has shaped human civilization for millennia. This poll tests your knowledge about one of the most significant retail innovations from the ancient world that continues to influence commerce today.

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The Lydians (7th century BCE), who minted electrum coins with consistent weights and official stamps
The Egyptians (2500 BCE), who used standardized gold rings of specific weights for market transactions
The Indus Valley civilization (2600 BCE), who developed uniform clay tablets with merchant seals for exchange
The Chinese Shang Dynasty (1600 BCE), who created standardized bronze cowrie replicas for marketplace use