Which retail innovation, introduced in the 1930s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Test your knowledge about the evolution of retail and the historical innovations that shaped how we shop today. Understanding retail history helps product developers and marketers appreciate how shopping behaviors and customer expectations have evolved over centuries. This trivia question focuses on a pivotal moment in retail history that fundamentally changed the shopping experience.

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Self-service shopping carts (invented by Sylvan Goldman for his Humpty Dumpty supermarket chain)
Barcode scanning systems (introduced by IBM for retail checkout)
Department store catalogs (pioneered by Montgomery Ward)
Electronic cash registers (developed by National Cash Register Company)