Which retail innovation, first introduced in the 1930s, revolutionized shopping by allowing customers to browse and select products themselves rather than requesting items from clerks behind counters?

Throughout history, retail has undergone dramatic transformations that reflect broader social and technological changes. From ancient marketplaces to modern shopping experiences, innovations in retail have shaped how societies function and how people access goods. This trivia question explores a pivotal innovation in retail history that fundamentally changed shopping behavior and set the stage for modern consumerism.

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Self-service shopping (the modern supermarket model)
Mail-order catalogs with home delivery
Department stores with multiple specialized sections
Installment payment plans for consumer goods