Which retail innovation, first introduced in the early 1900s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail innovations have transformed how people shop and interact with products. From ancient marketplaces to modern e-commerce platforms, the evolution of retail has been shaped by technological breakthroughs, changing consumer behaviors, and innovative merchandising techniques. This trivia question explores a pivotal moment in retail history that forever changed the shopping experience and set the foundation for modern consumption patterns.

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Self-service grocery stores (Piggly Wiggly, founded 1916)
Department store catalogs (Sears Roebuck, popularized 1890s)
Shopping malls (Country Club Plaza, opened 1922)
Vending machines (Horn & Hardart Automat, American debut 1902)