Which retail pioneer invented the first true self-service grocery store in 1916, fundamentally changing how people shop by allowing customers to select their own merchandise?

The way we shop today seems natural, but the history of retail contains fascinating innovations that revolutionized commerce. Before the 20th century, customers rarely selected their own merchandise—instead, they'd give their shopping lists to clerks who gathered items from behind counters. One retail innovation changed everything and led to the modern shopping experience we know today. Test your knowledge about this pivotal moment in retail history!

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Clarence Saunders with Piggly Wiggly stores
Frank W. Woolworth with Woolworth's five-and-dime stores
Sebastian S. Kresge with S.S. Kresge stores (later Kmart)
John Hartford with the A&P grocery chain