Which retail innovation of the 1930s revolutionized shopping by allowing customers to select their own merchandise without clerk assistance, leading to the self-service model used in most stores today?

The history of retail has seen dramatic transformations over centuries, from ancient marketplaces to today's omnichannel experiences. One particular innovation fundamentally changed how consumers interacted with products and established the foundation for modern retail strategies. Test your knowledge about this pivotal moment in retail history that influenced everything from store layouts to customer psychology.

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The shopping cart, invented by Sylvan Goldman in 1937
The supermarket concept, pioneered by Michael Cullen with King Kullen in 1930
The department store loyalty card, introduced by Marshall Field's in 1932
The cash register receipt, standardized by NCR Corporation in 1936