In which decade did product packaging first widely transition from purely functional design to becoming a primary marketing tool with extensive consumer psychology research backing design decisions?

Throughout history, product packaging has evolved dramatically, not just in materials but in purpose and design philosophy. Before modern marketing, packaging primarily served functional purposes - protection and preservation. The 20th century witnessed revolutionary changes in how brands presented their products, with one particular decade marking a significant shift toward packaging as a critical marketing tool. Test your knowledge of this pivotal moment in retail history that forever changed how products connect with consumers.

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1920s (Post-WWI consumer boom)
1950s (Post-WWII economic expansion)
1970s (Dawn of modern environmentalism)
1980s (Rise of supermarket competition)