Which pioneering retailer introduced the first successful self-service shopping concept in 1916, fundamentally changing how customers interacted with products and creating the modern supermarket model?

The way we shop today seems obvious - walking through aisles, selecting our own products, and taking them to checkout. But for most of retail history, this wasn't the case! Before the early 20th century, customers would present shopping lists to clerks who would gather items from behind counters. One innovative retailer changed everything with a revolutionary concept that transformed the shopping experience forever and shaped modern retail as we know it.

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Piggly Wiggly, founded by Clarence Saunders
A&P (Great Atlantic & Pacific Tea Company), founded by George Gilman
Woolworth's, founded by Frank Winfield Woolworth
Safeway, founded by Marion Barton Skaggs