Which retail innovation, invented by Norman Joseph Woodland and Bernard Silver in 1952, was first used commercially in 1974 and is now scanned over 6 billion times daily worldwide?

The world of retail has been transformed by numerous technological innovations throughout history. Some inventions have completely revolutionized how we shop, pay, and interact with products. This trivia question focuses on a pivotal retail technology innovation that fundamentally changed the shopping experience worldwide. Test your knowledge about this significant retail invention that bridges the physical product world with digital information systems!

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RFID (Radio-Frequency Identification) tags
UPC barcode system
Electronic cash register (ECR)
Self-checkout kiosk