What retail innovation was first introduced by Clarence Saunders in 1916 that fundamentally changed how consumers shop and is still prevalent today?

The history of retail has been shaped by technological innovations and changing consumer behaviors. From small general stores to global e-commerce giants, retail has undergone numerous transformations. This trivia question focuses on a pivotal moment in retail history that fundamentally changed how consumers shop. Test your knowledge of retail history and see if you can identify this revolutionary development!

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Self-service grocery stores (Piggly Wiggly)
Department store credit cards
Mail-order catalogs with delivery service
Shopping malls with multiple vendors