Which packaging innovation, introduced in the 1950s, is credited with revolutionizing retail by creating the concept of 'self-service' shopping?

Product packaging has evolved dramatically over the decades, transforming from simple protective coverings to sophisticated marketing tools. Today's packaging combines functionality, sustainability, and brand storytelling—but do you know which innovation truly revolutionized retail packaging and changed how consumers interact with products? Test your knowledge of this pivotal moment in retail history that continues to influence brand strategy and consumer behavior.

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Blister packaging (clear plastic packaging sealed to cardboard backing)
Shrink film technology (heat-shrinkable plastic film)
Barcode-integrated packaging
Unit packaging (individually wrapped products designed for self-selection)