Which retail innovation, first introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance and is considered the foundation of modern self-service retail?

Throughout history, retail has undergone dramatic transformations that shaped not only how we shop but also social structures and economic systems. The transition from traditional marketplaces to modern retail formats revolutionized commerce and consumer behavior. This trivia question focuses on a pivotal innovation in retail history that fundamentally changed the shopping experience and set the foundation for contemporary retail practices we take for granted today.

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Piggly Wiggly's self-service grocery store model
Macy's department store display windows
Sears Roebuck's mail-order catalog system
F.W. Woolworth's five-and-dime pricing structure