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

Throughout history, retail innovations have fundamentally changed how we shop and consume products. From ancient marketplaces to modern e-commerce, the evolution of retail reflects broader societal and technological changes. This trivia question focuses on a pivotal moment in retail history that transformed consumer behavior and set the stage for modern self-service shopping experiences.

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Piggly Wiggly's self-service grocery store
Sears Roebuck's mail-order catalog
F.W. Woolworth's five-and-dime store
Marshall Field's department store layout