Which retail pioneer opened the world's first true self-service grocery store in 1916, revolutionizing shopping by allowing customers to select their own products without clerk assistance?

The retail landscape dramatically changed in the early 20th century with innovations that transformed how consumers shop. One of the most significant developments was the introduction of self-service shopping, eliminating the need for clerk assistance and allowing customers to select their own products. This revolutionary concept fundamentally changed retail operations, store layouts, product packaging, and marketing strategies - setting the foundation for modern retail as we know it today.

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Clarence Saunders with Piggly Wiggly
Frank Woolworth with Woolworth's
Sebastian Spering Kresge with Kmart
John Hartford with A&P