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

The retail customer experience has evolved dramatically over the decades. Before the 1900s, shoppers would hand their shopping lists to clerks who would gather items for them. One revolutionary invention changed this dynamic forever, empowering customers to browse and select their own products—a concept we now take for granted. This innovation fundamentally transformed the retail customer journey and became the foundation for modern shopping experiences worldwide.

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The shopping cart (invented by Sylvan Goldman)
The self-service grocery store (Piggly Wiggly, founded by Clarence Saunders)
The barcode scanner (invented by Norman Joseph Woodland)
The cash register (patented by James Ritty)