Which retail innovation, first introduced in the 1930s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance and pioneered the concept of the modern supermarket?

Test your knowledge about pivotal moments in retail history that shaped our modern shopping experience. Before online marketplaces and big-box stores dominated the landscape, innovative retail concepts emerged that fundamentally changed how products were marketed and sold. This poll examines a key retail innovation that revolutionized consumer behavior and set the foundation for today's shopping experience.

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Self-service shopping carts (invented by Sylvan Goldman for Humpty Dumpty supermarkets)
Barcode scanners (invented by Norman Joseph Woodland and Bernard Silver)
Electronic cash registers (introduced by National Cash Register Company)
Window displays with mannequins (pioneered by L. Frank Baum before his Oz books)