Which retail innovation, launched in 1916, first allowed customers to select their own merchandise without clerk assistance, fundamentally changing shopping behavior?

The way we shop today seems intuitive, but the self-service retail model we take for granted was once a revolutionary concept. Before this innovation, customers would give their shopping lists to clerks who would fetch items from behind counters. Test your knowledge about this pivotal moment in retail history that fundamentally changed how we interact with products and transformed the shopping experience forever.

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Piggly Wiggly's self-service grocery store
Woolworth's five-and-dime merchandising system
Sears Roebuck's catalog showroom model
Marshall Field's department store browsing format