Which product innovation, first commercially successful in the 1970s, transformed retail by enabling automated checkout and inventory tracking?

In the evolution of retail and commerce, certain products have fundamentally changed how businesses operate and consumers shop. This trivia question explores one of the most transformative retail innovations of the 20th century—a technology that revolutionized inventory management, pricing strategies, and checkout efficiency across the globe. Test your knowledge about this pivotal moment in retail product development history!

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Universal Product Code (UPC) barcode system
Electronic cash register (ECR)
Credit card magnetic stripe technology
Electronic article surveillance (EAS) anti-theft tags