Which pioneering retailer first introduced the self-service shopping concept in 1916 that revolutionized retail by allowing customers to select their own goods from shelves?

In the early 20th century, the retail landscape transformed dramatically with innovations that shaped how we shop today. One revolutionary concept forever changed the customer experience by allowing shoppers to select their own merchandise without clerk assistance - a radical departure from traditional counter service where shoppers had to request each item from store employees. Test your knowledge of this pivotal moment in retail history that fundamentally altered the shopping experience worldwide.

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Piggly Wiggly, founded by Clarence Saunders in Memphis
A&P (Great Atlantic & Pacific Tea Company), founded by George Gilman
Woolworth's, founded by Frank Winfield Woolworth
Safeway, founded by Marion Barton Skaggs