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

The history of retail is filled with innovative breakthroughs that fundamentally changed how we shop. From the earliest department stores to modern e-commerce giants, retail evolution reflects broader societal and technological changes. This trivia question explores a pivotal moment in retail history that set the foundation for modern self-service shopping experiences we take for granted today.

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Piggly Wiggly (the first true self-service grocery store)
Woolworth's 5 & 10 (the first fixed-price merchandise store)
Marshall Field's (the first department store with browsable displays)
Sears Catalog (the first mail-order retail operation)