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

The history of retail has seen dramatic transformations that shaped how we shop today. From ancient marketplaces to digital storefronts, retail innovations have reflected broader societal and technological changes. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the shopping experience and established practices we take for granted today. Test your knowledge of retail history with this challenging question!

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Piggly Wiggly self-service grocery store
Sears mail-order catalog system
Marshall Field's department store with price tags
A&P economy grocery chain