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

The history of retail is filled with fascinating innovations that transformed how we shop. From humble beginnings to technological revolutions, retail history shows how commerce and culture intersect. This trivia question focuses on a pivotal moment in retail history that forever changed the consumer experience and set the foundation for modern shopping methods we take for granted today.

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Piggly Wiggly's self-service grocery store
Sears Roebuck's mail-order catalog
Woolworth's fixed price 'Five and Dime' store
Marshall Field's department store with display windows