Which retailer is credited with inventing the world's first true self-service grocery shopping model in 1916, fundamentally changing retail forever?

Before modern supermarkets transformed how we shop, grocery stores operated very differently. Customers would give their shopping lists to clerks who gathered items from behind counters. The invention of self-service grocery shopping revolutionized retail by allowing customers to select their own products, increasing store capacity, and transforming the shopping experience. This innovation led to dramatic changes in retail store layouts, product packaging, and marketing strategies that continue to evolve today.

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Piggly Wiggly (founded by Clarence Saunders)
A&P (The Great Atlantic & Pacific Tea Company)
Woolworth's Department Store
King Kullen (founded by Michael Cullen)