Which machine learning innovation was first successfully implemented in retail to dynamically adjust pricing based on demand, competitor pricing, and inventory levels?

Throughout history, certain technological innovations have revolutionized the retail industry, transforming how customers shop and how businesses operate. This trivia question focuses on machine learning applications that have made significant impacts in retail environments. Test your knowledge about these game-changing technological developments that have shaped modern commerce!

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IBM's Watson Price Optimization (2008)
Amazon's Dynamic Pricing Engine (2001)
Walmart's SmartPrice System (2005)
Target's Adaptive Price Intelligence (2003)