Who invented the world's first self-service shopping concept in 1916, revolutionizing retail design by allowing customers to select their own items instead of requesting them from clerks?

The way we shop today seems obvious, but the invention of self-service retail stores fundamentally transformed commerce. Before this innovation, customers had to request all items from clerks who retrieved products from behind counters. One pioneering inventor changed shopping forever by introducing a revolutionary retail design concept that empowered customers to select their own merchandise. Test your knowledge about this transformative retail innovation that shaped modern shopping experiences worldwide.

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Clarence Saunders (Piggly Wiggly stores)
Sebastian S. Kresge (Kmart founder)
Frank W. Woolworth (Woolworth's five-and-dime)
Michael Cullen (King Kullen supermarkets)