Which invention, first introduced in 1937, revolutionized retail by enabling self-service shopping and dramatically changing supply chain management?

Before this revolutionary invention, shopping looked very different. Stores had limited inventory, shoppers needed assistance from clerks to retrieve items, and the entire retail experience was slower and more labor-intensive. Then came an innovation that fundamentally transformed how consumers interact with products - creating the modern shopping experience we know today. Test your knowledge about this retail game-changer that enabled the self-service revolution and completely transformed supply chain management.

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Shopping cart (invented by Sylvan Goldman)
Barcode scanner (invented by Norman Woodland and Bernard Silver)
Conveyor belt checkout counter (invented by Walter Deubener)
Electronic point-of-sale system (invented by James Ritty)