Which retail giant was the first to introduce the revolutionary 'self-service' shopping concept in 1916, allowing customers to select their own merchandise without clerk assistance?

The landscape of retail has been shaped by visionary entrepreneurs who transformed small businesses into industry-defining empires. These retail pioneers introduced innovations that forever changed how we shop and consume goods. This trivia question explores one of the most significant early developments in modern retail history that laid the foundation for today's shopping experience.

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Piggly Wiggly, founded by Clarence Saunders
A&P (Great Atlantic & Pacific Tea Company), founded by George Gilman
Montgomery Ward, founded by Aaron Montgomery Ward
Woolworth's, founded by Frank Winfield Woolworth