Which retail innovation, first introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The way we shop today is dramatically different from how our ancestors acquired goods. Throughout history, retail has evolved from simple bartering systems to complex digital marketplaces. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer shopping habits and set the stage for modern retail experiences. Test your knowledge about this revolutionary retail innovation that transformed how people interacted with products!

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Self-service grocery stores (Piggly Wiggly)
Department stores (Selfridges)
Mail-order catalogs (Sears Roebuck)
Suburban shopping malls (Country Club Plaza)