Which product innovation from the 1970s was initially rejected by major retailers as 'unnecessary' but went on to process over $10 trillion in transactions annually worldwide?

Throughout history, certain product innovations have completely transformed the retail landscape and consumer behavior. These breakthrough inventions not only solved existing problems but created entirely new markets and possibilities. This trivia tests your knowledge about a pivotal retail innovation that revolutionized how consumers interact with products and businesses.

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Universal Product Code (UPC) barcode scanner
Electronic cash register (ECR)
Automated Teller Machine (ATM)
Credit card magnetic stripe