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

Throughout history, retail has undergone remarkable transformations that shaped how we shop today. From small general stores to massive department stores to e-commerce giants, the evolution of retail spaces and experiences reflects broader economic and social changes. This trivia question focuses on a pivotal innovation in retail history that fundamentally changed the shopping experience and set the foundation for modern retail as we know it.

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Self-service grocery store (Piggly Wiggly)
Department store credit card system
Shopping cart (introduced by Sylvan Goldman)
Barcode scanning system