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

The history of retail is filled with fascinating innovations that transformed how we shop. From ancient marketplaces to modern department stores, retail evolution reflects broader societal changes. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the shopping experience and set the foundation for modern retail as we know it today. Test your knowledge of retail history with this challenging question!

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Piggly Wiggly's self-service grocery store model
Woolworth's five-and-dime store concept
Sears Roebuck's mail-order catalog system
Marshall Field's department store customer service policies