Which ancient civilization invented the first standardized retail pricing system using price tags attached to merchandise?

Before modern shopping malls and e-commerce, ancient civilizations had their own sophisticated retail systems. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, retail innovation has deep historical roots. Test your knowledge about the retail innovations that shaped commerce in the ancient world and laid the foundation for many practices we still use today.

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Ancient Romans with their 'mercatus' system
Lydians in the 7th century BCE, who also invented the first coinage
Egyptians under Pharaoh Ramses II with their 'value marks'
Phoenician merchants with their 'trade seals'