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

The retail landscape we know today has evolved dramatically over centuries. From small general stores to massive shopping malls, the history of retail contains fascinating innovations and transformative business models that shaped consumer culture. This trivia question explores a pivotal moment in retail history that fundamentally changed how people shop. Test your knowledge about the origins of one of the most significant retail formats that revolutionized consumer behavior.

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Piggly Wiggly's self-service grocery store
Woolworth's five-and-dime store
Sears Roebuck's mail-order catalog
Marshall Field's department store