Which ancient civilization invented the world's first known loyalty program for customers, offering clay tokens that could be collected and exchanged for discounts on future purchases?

Before modern shopping malls and e-commerce, ancient civilizations had sophisticated retail systems that shaped their economies and societies. From Mesopotamian credit systems to Roman consumer protection laws, retail experiences have evolved over millennia. This poll tests your knowledge about one of history's most innovative ancient retail success stories that continues to influence shopping habits today.

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Ancient Egypt, where pharaoh-endorsed shops gave loyal customers 'ankh tokens' that provided discounts on imported goods
Mesopotamian merchants, who created 'shekel tablets' that regular customers could accumulate and redeem for preferential pricing
Ancient Greece, where the Agora marketplaces issued 'obol coins' to repeat customers, redeemable at participating merchant stalls
Roman Empire, where certain shops gave 'denarius stamps' to patrician families who could exchange complete sets for premium merchandise