Which retail marketing invention, first used commercially in 1974 on a pack of Wrigley's gum, is considered one of the most significant innovations in retail data collection?

The retail landscape has been transformed by numerous innovative discoveries and inventions throughout history. From barcode scanners to loyalty programs, technological advancements have revolutionized how products are marketed and sold. This trivia question focuses on a groundbreaking invention that fundamentally changed how retailers track inventory and collect consumer data. Test your knowledge about this pivotal retail marketing innovation!

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Universal Product Code (UPC) barcode
Electronic shelf label (ESL)
RFID inventory tracking tag
Magnetic strip loyalty card