Which ancient civilization invented the first known 'loyalty program' where clay tablets served as receipts that could be exchanged for discounts on future purchases?

Before modern retail loyalty cards and point systems, ancient civilizations had their own methods of encouraging repeat customers and rewarding loyal patrons. These early 'loyalty programs' helped establish trade relationships and build commercial empires. Test your knowledge about one of history's earliest documented customer retention systems!

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Mesopotamians (circa 1800 BCE)
Ancient Egyptians under Ramses II
Greek merchants in Athens' Agora
Roman Empire during the reign of Augustus