Which retail innovation, first introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail innovations have transformed how humans buy and sell goods. From ancient marketplaces to digital commerce, each breakthrough has reshaped society and economics. This trivia question focuses on a pivotal retail innovation that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Test your knowledge of retail history and the technological developments that brought us to today's shopping landscape!

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Piggly Wiggly self-service store model
Marshall Field's department store credit card
Sears Roebuck mail-order catalog delivery system
F.W. Woolworth's five-and-dime fixed pricing structure