Which retail technology innovation was first used commercially in 1974 at a Marsh Supermarket in Ohio, fundamentally changing inventory management?

The retail landscape has been transformed by numerous technological innovations throughout history. From the humble barcode to sophisticated AI-powered recommendations, these advancements have revolutionized how we shop and how retailers operate. This trivia question challenges your knowledge about a pivotal retail technology that changed the industry forever. Do you know which invention truly revolutionized inventory management and checkout efficiency?

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The UPC barcode scanner
Electronic cash registers (ECR)
Self-checkout kiosks
RFID inventory tracking