Which mathematical concept revolutionized retail by enabling Amazon's recommendation engine and is now used by most major retailers for personalized product suggestions?

The intersection of mathematics and retail has revolutionized how businesses understand consumer behavior. Advanced algorithms and statistical models now power everything from inventory optimization to personalized marketing. This trivia question explores how mathematical concepts have transformed retail analytics and consumer psychology, leading to more sophisticated approaches to product placement and sales techniques.

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Collaborative Filtering Matrix Factorization
Bayesian Probability Networks
Euclidean Distance Clustering
Markov Chain Monte Carlo Simulation