Which retail innovation, first widely implemented by Piggly Wiggly in 1916, fundamentally changed shopping by allowing customers to select their own merchandise?

The way we shop today seems obvious - walking through aisles, selecting our own items, and bringing them to checkout. But this 'self-service' model revolutionized retail history! Before this innovation, customers would hand shopping lists to clerks who gathered items from behind counters. This trivia question explores when and where this transformative retail strategy that forever changed shopping behavior first gained widespread adoption.

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Self-service shopping (customers selecting their own items from shelves)
Barcode scanners at checkout
Shopping carts with wheels
Store loyalty card programs