Which retail innovation from the early 20th century fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

Before modern shopping experiences became commonplace, retail underwent fascinating transformations that shaped how we shop today. This trivia question explores a pivotal retail innovation from history that fundamentally changed consumer shopping behavior and set the foundation for modern retail practices. Test your knowledge of retail history and see if you can identify which revolutionary concept truly transformed the shopping experience for the average consumer.

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Piggly Wiggly's self-service grocery store model (1916)
Marshall Field's introduction of the bargain basement (1902)
Macy's first escalator installation (1902)
Sears Roebuck's catalog distribution centers (1925)