Which innovative advertising technique did Ernest Elmo Calkins pioneer in the 1920s that revolutionized product marketing?

Throughout history, advertising techniques have evolved dramatically, reflecting changes in technology, culture, and consumer behavior. From ancient market criers to sophisticated digital campaigns, the evolution of advertising tells us much about how commerce and communication have developed over centuries. Test your knowledge about a pivotal moment in advertising history that changed how products were marketed forever!

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Consumer psychology-based advertising (analyzing consumer behavior to create targeted messaging)
Visual-dominant advertising (shifting from text-heavy ads to image-focused designs)
Celebrity endorsement campaigns (using famous people to promote products)
Radio jingles (creating memorable musical advertisements for audio broadcasting)