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

The retail landscape has been transformed by numerous innovations throughout history. From payment systems to store layouts, technological breakthroughs have revolutionized how we shop. This trivia question focuses on a pivotal invention that fundamentally changed the retail experience and customer service model, creating the foundation for modern self-service shopping. Test your knowledge about this game-changing retail innovation!

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The barcode scanner
The self-service grocery store (Piggly Wiggly)
The shopping cart
The cash register with receipt printing