Which revolutionary retail innovation, launched in the 1930s, fundamentally transformed product accessibility by introducing the concept of self-service shopping?

Throughout history, retail has undergone dramatic transformations that revolutionized how products reach consumers. From ancient marketplaces to modern digital storefronts, the evolution of retail product development has shaped economies and societies. This trivia question focuses on a pivotal moment in retail history that fundamentally changed product distribution and consumer access to goods. Test your knowledge of how innovative retail models disrupted traditional commerce!

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Piggly Wiggly self-service grocery stores (1916)
Sears mail-order catalog distribution centers (1893)
A&P's economy store model (1912)
Woolworth's five-and-dime retail concept (1879)