Which historic retail innovation, introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has evolved dramatically throughout history, with technological innovations reshaping how people shop. From the earliest general stores to today's AI-driven experiences, retail has continually adapted to changing consumer needs and technological capabilities. This trivia question explores a pivotal moment in retail history that fundamentally changed shopping behaviors and set the stage for modern retail innovations.

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
F.W. Woolworth's five-and-dime store concept
Marshall Field's department store with dedicated floor staff