Which invention, first used commercially in 1974 on a pack of Wrigley's chewing gum, revolutionized retail inventory management and is now scanned over 6 billion times daily worldwide?

Test your knowledge about one of the most transformative inventions in retail history! This innovation revolutionized inventory management and product tracking across the globe, fundamentally changing how retailers operate. While it may seem ordinary today, this technology represented a breakthrough that bridged the physical and digital retail worlds, enabling everything from self-checkout to supply chain optimization. Do you know which pioneering technology sparked this retail revolution?

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The Universal Product Code (UPC) barcode
The magnetic stripe card reader
The electronic cash register (ECR)
The RFID (Radio-Frequency Identification) tag