Which retail pioneer invented the first true self-service grocery store concept in 1916, allowing customers to select their own items without clerk assistance?

Before the 1910s, shopping involved clerks fetching products from behind counters while customers waited. This all changed with one revolutionary retail concept that forever transformed how we shop. Test your knowledge about this pivotal innovation in retail history that fundamentally changed the customer experience and shaped modern commerce as we know it today.

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Clarence Saunders with Piggly Wiggly
Frank W. Woolworth with Woolworth's 5 & 10
John Hartford with A&P
Sebastian S. Kresge with Kresge Stores (later K-Mart)