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 seen remarkable transformations that shaped how we shop today. From humble market stalls to global retail empires, innovations in shopping experiences have revolutionized commerce throughout history. This trivia question focuses on a pivotal development in retail history that fundamentally changed consumer culture and set the foundation for modern shopping experiences. Test your knowledge about this significant retail innovation!

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Piggly Wiggly self-service grocery store
Montgomery Ward mail-order catalog
Marshall Field's bargain basement
Woolworth's five-and-dime store