Which retail innovation, introduced in 1916, fundamentally transformed customer engagement by allowing shoppers to select their own merchandise without clerk assistance?

Test your knowledge about the historical foundations of modern retail! The retail industry has undergone remarkable transformations throughout history, with pioneering innovations that shaped how we shop today. This trivia question explores a significant milestone in retail history that revolutionized customer engagement and set the stage for modern retail management practices. Can you identify which retail innovation truly changed the shopping landscape in the early 20th century?

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