Which innovative store layout concept, first implemented in 1916, fundamentally changed retail by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail has undergone dramatic transformations, from ancient marketplaces to modern shopping experiences. This trivia question focuses on a pivotal moment in retail development that revolutionized how customers interacted with products. Test your knowledge of retail history and the innovations that shaped modern shopping behaviors!

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Piggly Wiggly's self-service model
Macy's department store grid system
Woolworth's counter-service layout
A&P's aisle-based grocery format