Which retail innovation, first used commercially in 1974 on a pack of Wrigley's gum, was described by the Smithsonian as 'the most significant retail invention of the 20th century'?

Throughout retail history, technological innovations have transformed how we shop. One particular breakthrough revolutionized inventory management and checkout processes worldwide, changing the retail landscape forever. Test your knowledge of this pivotal retail technology that bridged physical products with digital data systems and enabled the modern shopping experience we know today.

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Universal Product Code (UPC) barcode scanning system
Electronic anti-theft security tag
Magnetic stripe credit card reader
Digital price display system