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

The history of retail has been shaped by groundbreaking innovations that transformed how people shop. From humble market stalls to sophisticated digital experiences, retail history reveals how commerce has evolved alongside society. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the shopping experience and set the stage for modern retail concepts we take for granted today.

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Piggly Wiggly's self-service grocery store model
Macy's introduction of the price tag system
Sears Roebuck's mail-order catalog system
Marshall Field's introduction of the department store concept