Which retail innovation from the 1930s revolutionized store layouts by allowing customers to select their own merchandise without clerk assistance for the first time?

Before modern shopping experiences took shape, retail underwent fascinating transformations that set the foundation for today's commerce landscape. This trivia question explores a pivotal innovation in retail history that fundamentally changed how customers interacted with products and influenced store layouts for generations to come. Test your knowledge about the evolution of the shopping experience!

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Self-service grocery stores (like Piggly Wiggly)
Department store credit cards
Mechanical cash registers
Suburban shopping malls