Which packaging innovation, first commercially successful in the 1950s, revolutionized retail by enabling self-service shopping and is credited with changing consumer purchasing patterns forever?

The history of retail has been shaped by countless innovations, but packaging design breakthroughs have played a particularly crucial role in transforming how products are sold and consumed. This trivia question focuses on a pivotal packaging innovation from the 20th century that fundamentally altered consumer behavior and retail strategies. Test your knowledge of how packaging history has influenced modern retail practices!

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Tetrapak aseptic cartons that allowed milk and juices to be stored without refrigeration
Blister packaging that prevented product tampering after the Tylenol poisoning crisis
Aerosol spray cans that revolutionized the distribution of everything from paint to personal care products
Clear plastic packaging that allowed customers to see products before purchasing, enabling self-service retail models