Which retail innovation, first introduced in the 1930s, revolutionized shopping habits by allowing consumers to select their own merchandise without clerk assistance?

Throughout history, shopping habits have evolved dramatically, transforming from simple bartering to complex retail experiences. The 19th and 20th centuries saw particularly revolutionary changes in how people purchased goods. This trivia question focuses on a pivotal innovation that fundamentally changed consumer behavior and established patterns that would influence retail for generations to come. Test your knowledge about this transformative moment in retail history!

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Self-service shopping carts (introduced by Sylvan Goldman for Humpty Dumpty supermarkets)
Barcode scanners (developed by Norman Joseph Woodland and Bernard Silver)
Credit card payment systems (pioneered by Diners Club)
Automated checkout registers (invented by James Ritty as the 'Incorruptible Cashier')