Which advertising innovation from the 1920s is credited with creating the modern concept of 'brand personality' and revolutionized how products were marketed to consumers?

Throughout history, advertising techniques have evolved dramatically, shaping consumer culture and business strategies. This trivia focuses on a pivotal moment in advertising history that transformed how products were marketed and changed the relationship between brands and consumers. Test your knowledge about this significant shift in the advertising landscape that continues to influence marketing approaches today.

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Testimonial advertising featuring celebrities
Psychological marketing that focused on emotional benefits rather than product features
Direct mail catalog campaigns with product photographs
Radio jingles that created memorable audio branding