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

The retail landscape we know today evolved through significant historical innovations. From ancient marketplaces to modern malls, retail history reveals fascinating insights about commerce, consumer psychology, and technological adaptation. This trivia question focuses on a pivotal moment in retail history that fundamentally transformed shopping habits worldwide and set the foundation for modern retail experiences.

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Piggly Wiggly's self-service grocery store model
Macy's department store layout
Sears mail-order catalog system
Woolworth's five-and-dime pricing strategy