Which innovative retailer first introduced the concept of self-service shopping in 1916, allowing customers to select their own products without clerk assistance?

Before supermarkets and self-service shopping became the norm, customers relied on clerks to retrieve items from behind counters. The shift to self-service shopping transformed retail operations and customer experiences forever. This trivia question explores a pivotal innovation in retail history that fundamentally changed how we shop today and launched a retail revolution that continues to evolve with technologies like self-checkout and online shopping.

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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