Which retail innovation, invented in 1974 by Norman Joseph Woodland and Bernard Silver, was first used commercially in 1974 at a Marsh Supermarket in Ohio and is now scanned over 6 billion times daily?

The retail landscape has been transformed by numerous inventions and discoveries throughout history. Some innovations have completely revolutionized how we shop, while others quietly enhanced the consumer experience behind the scenes. This trivia question focuses on a groundbreaking invention that fundamentally altered retail operations and customer shopping behavior worldwide. Test your knowledge of retail innovation history!

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Universal Product Code (UPC) Barcode
Self-checkout kiosk
Electronic shelf labels (ESLs)
RFID inventory tracking tags