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

The retail landscape we know today evolved through centuries of innovation. From ancient marketplaces to digital storefronts, retail history reveals fascinating shifts in how products reach consumers. This trivia question focuses on a pivotal moment in retail history that fundamentally changed how people shop. Test your knowledge of this revolutionary retail format that transformed consumer culture and set the foundation for modern shopping experiences.

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Piggly Wiggly (the first self-service grocery store)
Woolworth's (the first five-and-dime store)
Marshall Field's (the first department store with browsable displays)
Sears Catalog (the first mail-order retail system)