Which retail innovation, first introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail has undergone significant transformations that have shaped how we shop today. From ancient marketplaces to digital storefronts, retail innovation has been driven by visionaries who challenged conventional thinking. This trivia question focuses on a pivotal moment in retail history that revolutionized the shopping experience and set the foundation for modern retail chains. Test your knowledge of this transformative period in consumer history!

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department store escalators (introduced by Harrods in 1898)
Shopping carts (invented by Sylvan Goldman in 1937)
Cash registers with receipt capability (patented by James Ritty in 1883)