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

The history of retail has transformed how we shop and consume products. From ancient marketplaces to digital storefronts, retail innovations have shaped economies and societies. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the shopping experience and created the foundation for modern commerce as we know it today. Test your knowledge about this revolutionary retail concept that altered consumer behavior forever!

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Piggly Wiggly self-service store
Woolworth's five-and-dime model
Marshall Field's department store layout
Sears mail-order catalog system