Which retail technology innovation, first implemented in 1974, fundamentally changed shopping by allowing products to be automatically identified at checkout without manual price entry?

Throughout history, technological innovations have revolutionized how people shop and how merchants sell. From ancient marketplaces to modern digital storefronts, retail technology has undergone remarkable transformations. This trivia question explores a pivotal moment in retail technology history that changed shopping habits forever and set the foundation for modern commerce systems we use today.

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The UPC barcode scanner, first used commercially at Marsh Supermarket in Ohio on a pack of Wrigley's gum
The electronic cash register with digital display, introduced by NCR Corporation at Macy's department store
The magnetic stripe card reader, first deployed at Bloomingdale's for store credit cards
The electronic shelf label system, pioneered by Sears to enable dynamic pricing without paper tags