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

Throughout history, retail has undergone significant transformations that shaped consumer behavior and shopping habits. From ancient marketplaces to today's digital commerce, retail innovations have reflected broader societal changes. This poll tests your knowledge of a pivotal moment in retail history that fundamentally changed how people shop and how merchants sell goods.

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Self-service grocery stores (like Piggly Wiggly)
Department stores with display windows
Mail-order catalogs with home delivery
Installment payment plans for large purchases