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

The retail landscape has transformed dramatically throughout history. Before the digital age revolutionized shopping, several key innovations fundamentally changed how consumers interacted with products and brands. This trivia question focuses on a pivotal moment in retail history that set the foundation for modern shopping experiences we take for granted 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
Marshall Field's department store personal shopper service