Which retail innovation, first implemented in 1916, fundamentally changed shopping behavior and is considered the precursor to modern self-service retail?

The retail industry has undergone dramatic transformations throughout history, from ancient marketplaces to today's omnichannel experiences. This trivia question focuses on a pivotal innovation that forever changed the shopping landscape and set the foundation for modern retail. Test your knowledge of retail history and see if you can identify this game-changing development that continues to influence shopping strategies today.

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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 merchandising approach
Marshall Field's department store customer service policies