Which mathematical modeling technique revolutionized retail supply chain management in the early 2000s by reducing inventory costs by up to 30% while maintaining or improving product availability?

Advanced mathematics plays a crucial role in modern retail supply chain management. From forecasting customer demand to optimizing inventory levels, mathematical algorithms help retailers make data-driven decisions. This trivia question explores a significant mathematical breakthrough that transformed how major retailers manage their inventory systems. Test your knowledge of how mathematical innovations have shaped retail operations!

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Stochastic Gradient Descent (SGD) algorithms
Multi-echelon inventory optimization (MEIO) models
Principal Component Analysis (PCA) for demand forecasting
Markov Decision Process (MDP) for shelf space allocation