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

The retail landscape has transformed dramatically over centuries. From humble general stores to digital marketplaces, retail history is filled with fascinating innovations that changed how people shop. This trivia question focuses on a pivotal moment in retail history that revolutionized the consumer experience and set the foundation for modern shopping practices. Test your knowledge about this significant retail breakthrough!

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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 with set prices