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

The history of retail has been shaped by revolutionary innovations that transformed how we shop. From humble beginnings to digital marketplaces, retail history reveals fascinating stories of entrepreneurship and consumer behavior changes. This trivia question focuses on a pivotal moment in retail history that forever changed the shopping experience. Test your knowledge of how modern shopping practices emerged!

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
F.W. Woolworth's fixed price 'five-and-dime' concept
Marshall Field's department store 'customer is always right' policy