Which ancient civilization invented the world's first known retail loyalty program, where merchants provided clay tokens to regular customers that could be exchanged for discounts?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the groundwork for today's commercial practices. From Mesopotamian bazaars to Roman shopping complexes, these early retail innovations shaped how goods were marketed, displayed, and sold. This trivia question explores one of the most significant retail innovations from the ancient world that continues to influence modern commercial practices.

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Ancient Egyptians, who offered papyrus loyalty scrolls to noble customers of the royal markets
Babylonians, who implemented the 'shekel-saver' system where clay tablets tracked repeat purchases at the central marketplace
Ancient Greeks, who provided loyalty olive-wood tokens at the Agora of Athens to frequent shoppers
Roman Empire merchants, who issued 'fidelis emptor' metal coins to patrician families who frequented their shops