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

Test your knowledge about one of the most significant innovations in retail history that transformed how we shop. This development changed the consumer experience forever, shifting power from store clerks to customers and revolutionizing the shopping model. Understanding this retail innovation helps us appreciate how modern shopping experiences evolved and why certain store layouts and customer behaviors became standard practice.

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Self-service grocery store (Piggly Wiggly)
Department store with multiple floors (Marshall Field's)
Mail-order catalog business (Sears Roebuck)
Membership warehouse club (Price Club)