Which retail technology innovation, first implemented in a supermarket in 1974, used a Universal Product Code (UPC) to dramatically change inventory management and checkout efficiency?

Throughout history, technological innovations have fundamentally transformed the retail landscape. From manual cash registers to today's AI-powered shopping experiences, each breakthrough has changed how merchants sell and how customers shop. This trivia question focuses on a pivotal moment in retail technology history that revolutionized inventory management and customer checkout experiences. Test your knowledge of retail history milestones!

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Barcode scanning technology
Electronic cash registers (ECR)
Self-service checkout kiosks
Magnetic stripe card readers