Which retail innovation, first introduced in 1937, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Before modern e-commerce transformed retail forever, one innovation fundamentally changed how consumers interacted with products in physical stores. This invention liberated shoppers from relying on clerks, allowing self-service and revolutionizing the shopping experience. Test your knowledge of this pivotal retail history moment that set the foundation for today's shopping experience!

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Shopping cart (invented by Sylvan Goldman for his Humpty Dumpty supermarket chain)
Barcode scanner (invented by Norman Joseph Woodland and Bernard Silver)
Self-checkout kiosk (invented by David R. Humble)
Electronic price tag (invented by Sándor Jeszenszky)