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

Throughout history, retail has transformed dramatically through technological innovation. From ancient marketplaces to today's AI-driven experiences, the evolution of shopping reflects changing societies and consumer behaviors. This trivia question focuses on a pivotal moment in retail history that revolutionized how customers shop and set the foundation for today's omnichannel retail experiences. Test your knowledge about this groundbreaking retail innovation!

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The department store model (Bon Marché)
The self-service grocery store (Piggly Wiggly)
Mail-order catalogs (Sears Roebuck)
The shopping mall (Country Club Plaza)