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

Before modern supermarkets and department stores changed how we shop, retail looked very different. The history of retail contains fascinating innovations that transformed shopping from a simple exchange of goods to the complex consumer experience we know today. This trivia question explores a pivotal moment in retail history that changed consumer behavior forever. Can you identify this revolutionary retail innovation?

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Piggly Wiggly self-service grocery store
Montgomery Ward mail-order catalog
Woolworth's five-and-dime store
A&P economy grocery chain