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 has shaped how we shop today. From ancient marketplaces to modern malls, retail innovation has transformed commerce and culture. This trivia question explores a pivotal moment in retail history that fundamentally changed how products were sold and purchased. Test your knowledge of retail history and see if you can identify this revolutionary development that continues to influence modern shopping experiences.

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Self-service grocery store (Piggly Wiggly)
Department store catalog (Sears Roebuck)
Drive-through service window (A&W)
Mail-order subscription box (Montgomery Ward)