Which retail innovation, first implemented in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

The history of retail has seen numerous innovations that transformed how people shop. From ancient marketplaces to modern digital commerce, retail history reveals fascinating stories of entrepreneurship and technological advancement. This trivia question focuses on a pivotal retail innovation that changed shopping forever. Test your knowledge of retail history and see if you can identify this game-changing development!

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Piggly Wiggly self-service store model
Woolworth's fixed-price system
Marshall Field's department store layout
Sears Roebuck mail-order catalog