Which innovative retail invention, first introduced in 1916, fundamentally changed shopping experiences by allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems intuitive, but the retail experience we take for granted was once a revolutionary innovation. Before the early 20th century, customers would present a shopping list to clerks who gathered items from behind counters. This poll explores a pivotal invention that transformed retail experiences forever, changing how customers interact with products and ultimately reshaping consumer psychology, store layouts, and marketing strategies worldwide.

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The shopping cart (invented by Sylvan Goldman)
The self-service grocery store (pioneered by Clarence Saunders with Piggly Wiggly)
The barcode scanner (developed by Norman Joseph Woodland)
The cash register with receipt (invented by James Ritty)