Which groundbreaking retail innovation is credited as the world's first true 'self-service' shopping model, allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems obvious—walking through stores, selecting our own items, and bringing them to checkout. But this wasn't always the case! For centuries, shoppers would give their shopping lists to clerks who would gather items from behind counters. The self-service revolution fundamentally changed retail and consumer behavior forever, creating the shopping experience we now take for granted. Test your knowledge about this pivotal retail innovation that transformed commerce worldwide.

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Piggly Wiggly stores, founded by Clarence Saunders in 1916
Woolworth's 'five and dime' stores, introduced in 1879
A&P's 'economy stores' model launched in 1912
Montgomery Ward's mail-order catalog system from 1872