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

The history of retail has shaped how we shop today. From ancient marketplaces to digital platforms, retail innovations have transformed commerce and consumer culture throughout history. This trivia question focuses on a pivotal moment in retail history that revolutionized the shopping experience and set the foundation for modern retail practices. Test your knowledge about this significant product launch that changed shopping forever!

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