Which retail innovation from the 1970s is considered the forerunner to modern customer analytics by being the first widespread method to directly link purchases to specific customers?

Before modern analytics and digital transformation swept through retail, companies relied on different methods to understand their customers. This trivia question explores a pivotal moment in retail customer analytics history that fundamentally changed how businesses gather and use consumer data. Test your knowledge of how one innovation transformed retail customer understanding forever!

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Department store credit cards
Customer comment cards
Universal Product Code (UPC) barcodes
Mall intercept surveys