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

Retail has experienced numerous revolutionary changes throughout history. From ancient marketplaces to modern e-commerce giants, the evolution of how products are sold and marketed reveals fascinating insights about human societies and technological development. This trivia question focuses on a pivotal innovation that transformed the retail landscape in the early 20th century and set the foundation for modern shopping experiences we take for granted today.

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Piggly Wiggly self-service grocery store
Woolworth's five-and-dime store model
Sears mail-order catalog system
A&P economy grocery chain