Which ancient civilization pioneered the use of 'ostraka' (pottery fragments) as an early customer loyalty tracking system for repeat buyers at marketplaces?

The ancient world had surprisingly sophisticated retail systems and customer loyalty mechanisms. Before modern technology, ancient civilizations developed innovative ways to track purchases, reward repeat customers, and promote their goods. This poll explores how ancient merchants utilized early forms of retail customer analytics to understand their clientele and improve their market position. Test your knowledge about how our ancestors approached retail operations thousands of years ago!

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Ancient Egyptians, who recorded customer purchases on limestone ostraka to offer tiered benefits to regular patrons of royal workshops
Ancient Greeks, who used marked ostraka as proof-of-purchase tokens that could be redeemed for discounts after accumulating sufficient quantities
Mesopotamians, who implemented clay token systems exclusively for nobility to track their spending at preferred merchants
Roman Empire merchants, who distributed ceramic fragments as an early 'buy nine, get one free' program for wine and olive oil purchases