Which mathematical concept revolutionized product recommendation algorithms in online retail, leading to a significant shift in personalized marketing strategies?

In the competitive world of retail, mathematics has become a powerful tool for optimizing marketing strategies and understanding consumer behavior. From predictive analytics to algorithmic pricing models, the integration of mathematical principles has transformed how products are marketed and sold. This poll explores an innovative mathematical approach that revolutionized retail strategy and consumer product marketing in recent years.

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Markov Chain Monte Carlo (MCMC) simulations
Matrix factorization and collaborative filtering
Differential calculus optimization
Euclidean distance clustering