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

Throughout history, retail has undergone revolutionary transformations that shaped how we shop today. From ancient marketplaces to digital storefronts, retail innovations have reflected societal changes and technological advancements. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the consumer experience and set the foundation for modern shopping practices we take for granted today.

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Piggly Wiggly's self-service grocery store model
Macy's department store credit card system
Sears Roebuck's mail-order catalog distribution
Marshall Field's "Bargain Basement" discount section