Which 1920s marketing innovation first introduced the concept of 'consumer psychology' to create emotional connections between customers and products?

Throughout history, marketing strategies have evolved dramatically with changing technologies and consumer behaviors. One particular innovation stands out for revolutionizing how products were sold and marketed to the masses, creating the foundation for modern consumer culture. Test your knowledge of this pivotal moment in marketing history that changed how companies connected with customers forever.

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Edward Bernays' 'Torches of Freedom' campaign that linked cigarettes to women's liberation
Henry Ford's assembly line manufacturing that emphasized product affordability over emotional appeal
The Sears Roebuck catalog's direct-mail system that focused on product specifications
Thomas Edison's product demonstrations that emphasized technical innovation rather than emotional benefits