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 undergone dramatic transformations. From ancient marketplaces to digital storefronts, the evolution of how we buy and sell has shaped economies and cultures. This trivia question explores a pivotal moment in retail history that forever changed how consumers interact with products. Test your knowledge about the revolutionary retail concept that altered shopping behaviors worldwide!

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The shopping mall (The Country Club Plaza in Kansas City)
Self-service grocery store (Piggly Wiggly)
The department store (Marshall Field's)
Mail-order catalog (Montgomery Ward)