Which retail innovation, introduced in 1937, dramatically transformed shopping by allowing customers to select products themselves rather than relying on clerk assistance?

The evolution of retail has been marked by pivotal innovations that forever changed how we shop. From the first department stores to digital commerce, certain breakthrough moments stand out as transformative in retail history. Test your knowledge of one such revolutionary development that fundamentally altered the retail landscape and consumer behavior in the 20th century.

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Self-service shopping carts (introduced by Sylvan Goldman at Humpty Dumpty supermarket)
Barcode scanning technology (developed by Norman Joseph Woodland)
Department store credit cards (pioneered by Wanamaker's)
Shopping mall food courts (first implemented by the Southdale Center)