Which advertising innovation from the 1960s was nicknamed 'the Creative Revolution' and fundamentally changed how products were marketed?

Throughout history, advertising techniques have evolved dramatically, transforming how products reach consumers. From ancient market criers to digital algorithms, the methods businesses use to promote their offerings reflect technological and social changes. This trivia question focuses on a pivotal moment in advertising history that fundamentally changed the industry and set the stage for modern marketing approaches.

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The introduction of emotional storytelling and creative visuals over hard-selling product features
The first use of celebrity endorsements in television commercials
The invention of focus groups to test advertising effectiveness
The development of demographic targeting through Nielsen ratings