Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has undergone dramatic transformations throughout history. From ancient marketplaces to modern e-commerce giants, innovations in product design and sales strategies have shaped how we shop. This trivia question explores a pivotal moment in retail history that forever changed how products were sold and consumer behavior was understood. Test your knowledge about this revolutionary retail concept that emerged in the early 20th century!

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Self-service grocery store (Piggly Wiggly)
Mail-order catalog (Montgomery Ward)
Department store (Macy's)
Five and dime store (Woolworth's)