Which technology first enabled mass retail personalization that increased average purchase values by over 30% when implemented in the early 2000s?

In today's highly competitive retail landscape, personalization has become a crucial strategy for customer retention and conversion. But do you know which technological innovation truly revolutionized the way retailers could personalize customer experiences at scale? Test your knowledge about the history of retail personalization technology and how it transformed the industry's approach to customer engagement.

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Collaborative filtering algorithms pioneered by Amazon's recommendation engine
RFID tracking systems for inventory and customer movement patterns
Facial recognition systems with demographic analysis capabilities
Augmented reality fitting rooms with personalized style suggestions