Which retail innovation, first introduced in the 1930s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Before modern retail experiences became commonplace, innovations in shopping fundamentally changed how consumers interacted with products. The industrial revolution and technological advancements of the 19th and 20th centuries transformed retail from simple merchant stalls to sophisticated shopping experiences. Test your knowledge about a pivotal retail innovation that changed shopping history forever!

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Self-service grocery stores (like Piggly Wiggly)
Department stores with escalators
Mail-order catalogs with home delivery
Drive-through purchasing windows