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

The retail landscape has transformed dramatically over centuries. From ancient marketplaces to digital storefronts, the evolution of how we buy and sell goods reflects broader economic and technological changes. This trivia question explores a pivotal moment in retail history that forever changed shopping habits and set the stage for modern commerce 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 five-and-dime store concept
A&P's chain store standardization approach