What 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 has transformed dramatically throughout history, with certain innovations fundamentally changing how consumers shop and businesses operate. This trivia question focuses on a pivotal moment in retail history that revolutionized the consumer experience and set the foundation for modern shopping habits. Test your knowledge of retail history and see if you can identify this game-changing innovation!

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The self-service grocery store (Piggly Wiggly)
The department store credit card system
The mail-order catalog with cash-on-delivery
The shopping mall with multiple retailers