Which innovative retail technology, first introduced in 1937, revolutionized customer experience by allowing shoppers to select their own merchandise without clerk assistance?

Before modern supermarkets and self-checkout kiosks transformed our shopping experiences, retail was a completely different world. Customers relied on clerks to fetch products from behind counters, limiting product discovery and slowing the shopping process. This trivia explores a pivotal invention that revolutionized retail customer experience and fundamentally changed how we shop today. Test your knowledge about this transformative retail technology!

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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)
Electronic cash register (invented by James Ritty)
Automatic door (invented by Hortense and Raymond Hockenberry)