Which retailer was the first to implement a mathematically-driven recommendation engine that used collaborative filtering algorithms to suggest products to customers?

In the world of retail, advanced mathematics has revolutionized how companies understand customer behavior and optimize operations. Data-driven decision making is now central to retail strategy, but which company was truly revolutionary in this space? Test your knowledge about the intersection of mathematics and retail analytics with this challenging question about the pioneers who transformed the industry with mathematical modeling.

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Amazon (1998)
Walmart (2003)
Target (2001)
eBay (2000)