What retail innovation, first successfully implemented in 1916 by Clarence Saunders, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail industry has undergone dramatic transformations throughout history, from ancient marketplaces to modern digital storefronts. This trivia question explores a pivotal moment in retail history that fundamentally changed how consumers interact with products and revolutionized shopping behaviors. Test your knowledge about this significant historical retail innovation!

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Self-service grocery stores (Piggly Wiggly)
Mail-order catalogs (Montgomery Ward)
Department stores (Macy's)
Discount chain stores (Woolworth's)