Which ancient civilization created the first documented merchant loyalty program, where clay tablets served as 'loyalty cards' for preferred customers around 2000 BCE?

Before modern retail loyalty cards and digital points systems, ancient civilizations developed sophisticated methods to encourage repeat customers and reward loyal patrons. These early customer retention strategies helped establish trade networks and build commercial relationships that sometimes spanned continents. Test your knowledge about one of history's earliest documented customer loyalty systems!

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Sumerians in Mesopotamia
Ancient Egyptians under Ramses II
Phoenician maritime traders
Indus Valley merchants