Which retail innovation, introduced in 1916, fundamentally changed shopping behavior and is considered the precursor to modern supermarkets?

The retail landscape has undergone dramatic transformations throughout history, with certain innovations fundamentally changing how consumers shop. Before the digital revolution and modern supply chains, one particular retail innovation in the early 20th century forever altered the shopping experience and set the stage for modern retail as we know it. Test your knowledge about this pivotal moment in retail history!

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Piggly Wiggly's self-service shopping model
Macy's introduction of the department store concept
Sears Roebuck's mail-order catalog system
A&P's grocery chain standardization