Which accidental discovery, initially rejected by its inventor's employer, led to the creation of a retail innovation now used in virtually every store worldwide?

Throughout history, some of the most transformative retail innovations emerged not from careful planning, but from fortunate accidents or unexpected observations. These serendipitous discoveries revolutionized how we shop and interact with products. Test your knowledge of these pivotal moments in retail innovation history that shaped modern commerce and consumer experiences.

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The barcode scanner - rejected by IBM before its inventor Norman Joseph Woodland patented it independently
The shopping cart - rejected by Kroger before Sylvan Goldman introduced it at his Humpty Dumpty supermarket chain
The point-of-sale terminal - rejected by NCR before James Ritty developed the first mechanical cash register
The electronic anti-theft tag - rejected by Sensormatic before Ron Assaf created the first retail security system