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

Throughout history, retail has transformed dramatically, with innovations that fundamentally changed how people shop. The 20th century saw particularly revolutionary developments in retail formats, consumer engagement, and shopping experiences that laid the foundation for today's commerce landscape. Test your knowledge about a pivotal moment in retail history that continues to influence modern shopping behaviors and store designs.

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