Which retail innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

The history of retail has seen remarkable transformations that shaped how we shop today. From ancient marketplaces to digital storefronts, retail evolution reflects broader societal and technological changes. This trivia question focuses on a pivotal innovation in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Test your knowledge about one of retail's most significant historical developments!

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Self-service grocery store (Piggly Wiggly)
Department store with multiple product categories
Mail-order catalog with home delivery
Subscription-based membership shopping club