Which product innovation from the 1930s revolutionized food retail by allowing customers to select their own items rather than requesting them from clerks behind counters?

Before modern conveniences and sleek designs, product innovation was still transforming how people lived. This trivia question explores a groundbreaking product innovation from history that changed retail and consumer behavior forever. Test your knowledge about how historical product innovations shaped the commercial landscape we know today!

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The shopping cart, invented by Sylvan Goldman in 1937 for his Humpty Dumpty supermarket chain
The cash register with printed receipts, invented by James Ritty in 1932
The price tag system, introduced by F.W. Woolworth in 1935
The refrigerated display case, patented by Clarence Birdseye in 1934