Which product design innovation, first introduced in 1937, revolutionized self-service shopping and is now found in virtually every grocery store worldwide?

In the world of retail and product design, some innovations fundamentally transform how consumers interact with products. Behind every revolutionary design lies a fascinating story of problem-solving and consumer insight. This poll tests your knowledge about a groundbreaking product design that dramatically altered shopping habits worldwide and created an entirely new approach to retail merchandising. Do you know which invention truly revolutionized how products are presented to consumers?

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The shopping cart, invented by Sylvan Goldman to help customers buy more items comfortably
The barcode scanner, developed by Norman Joseph Woodland to speed up checkout times
The conveyor belt checkout system, created by Walter Diemer to streamline purchases
The self-checkout kiosk, designed by David R. Humble to reduce waiting times