Which retail innovation, introduced in the early 20th century, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

Throughout history, retail has undergone dramatic transformations that have shaped how we shop today. From ancient marketplaces to modern digital storefronts, innovations in retail have reflected broader societal changes and technological advancements. This trivia question explores a pivotal moment in retail development that fundamentally changed consumer behavior and set the stage for modern shopping experiences.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Mail-order catalogs (popularized by Montgomery Ward in 1872)
Department stores (like Bon Marché, established in 1852)
Shopping arcades (such as Burlington Arcade, opened in 1819)