Which retail innovation, first used at an Ohio supermarket in 1974, revolutionized checkout speed and inventory tracking?

Throughout history, certain retail innovations have fundamentally transformed how people shop. These breakthroughs didn't just change stores—they altered consumer behavior, economic patterns, and even social interactions. This trivia question focuses on one of the most revolutionary retail technologies that emerged in the mid-20th century and completely transformed checkout efficiency and inventory management. Test your knowledge of this pivotal moment in retail history!

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UPC barcode scanning system
Self-service shopping cart (introduced by Sylvan Goldman)
Electronic credit card processing terminals
Automated inventory management software