Which ancient civilization used 'ostraka' (pottery fragments) as an early form of customer feedback and market research tool in their agoras (marketplaces)?

Before modern retail analytics, ancient civilizations developed sophisticated methods to track customer preferences and market trends. From Phoenician trade records to Roman market surveys, these early civilizations pioneered customer analytics in surprisingly advanced ways. Test your knowledge about how ancient merchants gathered and used customer data to optimize their marketplace offerings and trading strategies.

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Ancient Egyptians, who recorded purchase histories on papyrus scrolls for nobility
Ancient Greeks, who collected written customer opinions and tallied preferences for different goods
Babylonians, who used clay tablets to document marketplace trends by season
Romans, who conducted citizen surveys about imported vs. local goods in the Forum