Which retail innovation from the 1950s revolutionized product development by systematically collecting and analyzing customer feedback for the first time?

Throughout history, retail has been transformed by revolutionary product innovations and marketing strategies. From ancient marketplaces to digital storefronts, the evolution of how products are developed, positioned, and sold tells us much about society's changing values and technological capabilities. This trivia question focuses on a pivotal moment in retail history that fundamentally changed how businesses approached product development and consumer engagement.

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Focus groups pioneered by Ernest Dichter
IBM's first electronic cash register system
Sears catalog's customer review cards
A&P's customer loyalty program