Which advertising innovation of the 1920s was dubbed 'the golden age of advertising' and revolutionized product marketing by introducing psychological appeals and creating artificial needs?

Throughout history, advertising techniques have evolved dramatically with technology and cultural shifts. The 20th century in particular saw revolutionary changes in how products were marketed to consumers. This trivia question focuses on a pivotal moment in advertising history that changed how brands connected with consumers and established modern marketing principles that we still see today.

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Scientific Advertising approach pioneered by Claude Hopkins
Edward Bernays' emotional appeal techniques and 'engineering of consent'
The Unique Selling Proposition method developed by Rosser Reeves
David Ogilvy's brand image marketing strategies