Which retail innovation, introduced in 1916, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail is filled with innovations that transformed how people shop and consume products. From ancient marketplaces to department stores to online shopping, retail evolution reflects broader societal changes. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer culture and shopping behaviors across America and eventually the world.

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Self-service grocery store (Piggly Wiggly)
Department store credit cards
Mail-order catalogs with photographs
Price tags with fixed pricing