Which 1950s-60s advertising campaign is credited with revolutionizing marketing by introducing the concept of 'unique selling proposition' (USP) and focusing on brand differentiation?

Throughout retail history, certain advertising campaigns have fundamentally changed how products are marketed to consumers. This poll tests your knowledge about one of the most transformative marketing strategies that revolutionized consumer advertising in the mid-20th century. Do you know which groundbreaking campaign shifted advertising from product features to emotional appeals and lifestyle associations?

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Marlboro's 'Marlboro Man' campaign by Leo Burnett
Volkswagen's 'Think Small' campaign by Doyle Dane Bernbach
De Beers' 'A Diamond is Forever' campaign by N.W. Ayer & Son
Coca-Cola's 'Things Go Better with Coke' campaign by McCann-Erickson