Which ancient civilization created a sophisticated 'customer tracking system' in their marketplaces using clay tokens that represented purchases, allowing merchants to analyze shopping patterns?

Before modern sentiment analysis and IoT, ancient civilizations pioneered sophisticated methods to track consumer behavior and optimize their marketplaces. Archaeological evidence reveals surprising parallels between ancient retail analytics and today's data-driven approaches. This trivia challenges you to identify which ancient civilization implemented one of history's first systematic retail customer analytics systems—a method that would be recognizable to today's retail analysts.

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Mesopotamians (3500 BCE), who used clay bullae containing tokens to record individual customer purchases and analyzed patterns to optimize inventory
Ancient Egyptians (2500 BCE), who maintained papyrus scrolls of customer preferences organized by social class and regional origin
Indus Valley merchants (2600 BCE), who used a stamp seal system to track repeat customers and their preferred goods
Ancient Chinese (1200 BCE), who employed bamboo tally sticks marked with customer identifiers to analyze buying patterns across seasons