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

Throughout history, retail innovations have transformed how we shop and consume products. From ancient marketplaces to today's AI-powered experiences, retail history is filled with fascinating milestones. This trivia question focuses on a pivotal development in modern retail history that forever changed the shopping landscape. Test your knowledge about this revolutionary retail concept that laid the foundation for today's shopping experience!

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Piggly Wiggly's self-service grocery store
Macy's department store catalog system
Woolworth's five-and-dime merchandise model
Marshall Field's money-back guarantee policy