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

Before modern shopping malls and online stores dominated the retail landscape, innovative store designs and marketing approaches shaped how consumers interacted with products. This trivia question explores a groundbreaking retail innovation that fundamentally changed shopping behavior in the early 20th century, setting the foundation for modern self-service retail 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
Woolworth's five-and-dime store concept
Marshall Field's department store window displays