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

In the annals of retail history, certain innovations transformed how we shop forever. From humble beginnings to global phenomena, retail giants have shaped consumer culture in profound ways. This trivia question explores a pivotal moment in retail history that revolutionized the shopping experience and set the foundation for modern commerce as we know it today. Test your knowledge of retail history and see if you can identify this game-changing retail innovation!

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The shopping mall
The self-service grocery store (Piggly Wiggly)
The department store catalog
The checkout counter with cash register