Which retailer is credited with inventing the modern self-service grocery store concept in 1916, fundamentally changing how people shopped by allowing customers to select their own merchandise?

The history of retail has been shaped by innovative pioneers who transformed how we shop. From small general stores to massive department stores, supermarkets, and eventually e-commerce giants, retail history reflects broader economic and social changes. This trivia question focuses on a pivotal moment in retail history that changed shopping forever. Test your knowledge about this revolutionary retail concept!

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Piggly Wiggly (founded by Clarence Saunders)
A&P (founded by George Huntington Hartford)
Woolworth's (founded by Frank Winfield Woolworth)
Sears (founded by Richard Warren Sears)