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

Throughout history, retail innovations have dramatically changed how we shop. From ancient bazaars to modern digital marketplaces, the evolution of retail reflects broader societal and technological changes. This trivia question focuses on a pivotal moment in retail history that fundamentally transformed the shopping experience and set the foundation for modern retail as we know it today.

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
F.W. Woolworth's fixed-price merchandise model
A&P's chain store grocery concept