Which invention is credited with enabling the first modern retail loyalty program, allowing S&H Green Stamps to track customer purchases in the 1950s?

Loyalty programs have revolutionized how customers interact with brands and how companies gather valuable consumer data. While ubiquitous today, these programs have fascinating origins tied to specific inventions and innovations that changed retail forever. Test your knowledge about the history and evolution of customer loyalty programs that sparked a revolution in consumer behavior tracking and personalized marketing.

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The cash register with receipt printing capability
The UPC barcode scanner
The magnetic stripe card
The mechanical coin counter