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

The retail landscape has undergone dramatic transformations throughout history. From humble marketplaces to global e-commerce giants, innovations in how we shop have shaped economies and cultures worldwide. This trivia question focuses on a pivotal invention that fundamentally changed the retail experience for consumers and created the foundation for modern shopping as we know it today. Test your knowledge of retail history with this challenging question!

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Self-service grocery store (Piggly Wiggly)
The shopping cart (introduced by Sylvan Goldman)
The cash register (patented by James Ritty)
The barcode scanner (invented by Norman Woodland)