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

Before modern shopping became what we know today, retail underwent significant transformations throughout history. From ancient marketplaces to modern malls, retail innovations have shaped how we shop and consume. This trivia question focuses on a pivotal development in retail history that fundamentally changed the shopping experience and set the stage for contemporary retail trends.

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Self-service grocery store (Piggly Wiggly)
Department store with fixed pricing (Bon Marché)
Mail-order catalog shopping (Montgomery Ward)
Shopping arcade with glass roof (Burlington Arcade)