Which packaging innovation from the 1920s revolutionized retail by allowing customers to see products before purchase and is credited with launching the concept of self-service grocery stores?

In the history of retail, packaging innovations have dramatically shaped consumer behavior and brand success. One particular packaging breakthrough in the early 20th century revolutionized how products were sold and consumed, creating an entirely new market approach. This innovation changed not just how products were preserved, but fundamentally altered the consumer-product relationship. Test your knowledge about this pivotal moment in retail history!

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Cellophane transparent packaging
Aluminum cans with pull tabs
Cardboard boxes with colorful printing
Vacuum-sealed glass jars