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

The retail landscape has undergone dramatic transformations throughout history. From ancient marketplaces to digital storefronts, retail innovations have shaped how we shop and consume products. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the customer journey and shopping experience, setting the foundation for modern retail practices we still see today.

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
Woolworth's five-and-dime store concept
Marshall Field's department store fixed-price policy