Which groundbreaking retail invention, patented in 1974, was first used commercially on a pack of Wrigley's gum at an Ohio supermarket and is now scanned over 6 billion times daily worldwide?

The retail landscape has been transformed by numerous inventions and technological breakthroughs throughout history. From the humble barcode to sophisticated artificial intelligence systems, these innovations have changed how we shop, pay, and interact with products. This trivia question explores a significant retail invention that revolutionized the shopping experience and laid the groundwork for modern digital commerce.

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UPC Barcode
Electronic Cash Register (ECR)
RFID Tag
Self-Service Checkout