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

The retail landscape has undergone remarkable transformations throughout history, with technological innovations reshaping how we shop and interact with products. From the earliest general stores to today's AI-powered shopping experiences, retail history demonstrates how commerce adapts to changing societal needs. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the consumer experience and set the stage for modern shopping dynamics.

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Piggly Wiggly's self-service grocery store model
Woolworth's five-and-dime store concept
Sears Roebuck's mail-order catalog system
Marshall Field's department store with fixed pricing