Which innovative store layout concept, first introduced in 1916, fundamentally transformed retail by allowing customers to select their own merchandise without clerk assistance?

Before today's sleek shopping malls and one-click online purchases, retail underwent fascinating transformations. Store layouts have evolved dramatically throughout history, reflecting changing consumer behaviors, technological innovations, and cultural shifts. This trivia question explores a pivotal moment in retail history that forever changed how products were presented to customers and revolutionized the shopping experience.

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Piggly Wiggly's self-service grocery store model
Marshall Field's department store window displays
Woolworth's five-and-dime counter arrangement
Sears Roebuck's catalog showroom format