Which retail pioneer introduced the first true self-service grocery shopping model in 1916, allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems obvious, but the self-service retail model we take for granted was once a revolutionary concept. Before the early 20th century, customers would give their shopping lists to clerks who would gather items for them. This trivia question explores a pivotal innovation in retail history that fundamentally changed how consumers interact with products and stores, creating the foundation for modern shopping experiences worldwide.

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Clarence Saunders with Piggly Wiggly
Frank W. Woolworth with F.W. Woolworth Company
Sebastian S. Kresge with S.S. Kresge Company (later Kmart)
James Cash Penney with J.C. Penney