Which retail innovation, first implemented in 1974 at an Ohio supermarket, revolutionized inventory tracking and is now used on virtually all retail products worldwide?

Throughout history, technological innovations have dramatically transformed the retail landscape, reshaping how consumers shop and how businesses operate. From the humble beginnings of the cash register to today's sophisticated AI-powered recommendation engines, each breakthrough has marked a significant milestone in retail evolution. This trivia question focuses on a pivotal innovation that revolutionized inventory management and pricing strategies worldwide.

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Universal Product Code (UPC) barcode
Electronic price tag system
RFID inventory tracking
Digital receipt technology