Which pioneering e-commerce recommendation system from the 1990s revolutionized online retail by introducing collaborative filtering that compared customer purchase histories?

Before AI algorithms and machine learning transformed how we shop, retail recommendation systems have a fascinating history dating back decades. From early catalog techniques to the sophisticated algorithms of today, the evolution of how merchants suggest products to customers reveals much about both technological advancement and changing consumer behavior patterns. Test your knowledge about this intriguing intersection of retail history and technology!

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