Which technological invention in the 1970s made modern retail loyalty programs possible by enabling businesses to track individual customer purchases?

Loyalty programs have transformed retail marketing strategies, but their origins are tied to specific inventions and innovative thinking. These programs started as simple stamp-collecting schemes but evolved into sophisticated digital systems that track consumer behavior and preferences. This poll tests your knowledge about a pivotal moment in retail history when technology and marketing strategy converged to create what we now recognize as modern loyalty programs.

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The Universal Product Code (UPC) barcode system
The magnetic stripe card
The electronic cash register
The RFID tag