Which data analytics technique revolutionized Amazon's book recommendation system and significantly increased their cross-selling success in the early 2000s?

In the competitive world of book retail, publishers and bookstores often use sophisticated data analytics to predict which titles will become bestsellers and how to market them effectively. Understanding the relationship between literary works and consumer behavior can reveal fascinating insights about brand loyalty and marketing strategy in the publishing industry. Test your knowledge about the business side of literature!

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Collaborative filtering
Sentiment analysis of book reviews
Purchase history clustering
Demographic profiling of readers