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

The history of retail has transformed how humans shop and consume products. From ancient marketplaces to modern shopping malls, retail innovations have shaped economies and cultures. This trivia question focuses on a pivotal moment in retail history that changed how consumers interact with products and established foundations for modern shopping experiences we take for granted today.

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Piggly Wiggly self-service grocery store
Woolworth's five-and-dime store
Macy's department store layout
A&P economy grocery chain