Which advertising innovation became widely adopted during the Great Depression as companies sought to build consumer trust during economic hardship?

During the Great Depression (1929-1939), companies faced unprecedented challenges in reaching cash-strapped consumers. This economic crisis forced a fundamental shift in advertising strategies that would shape marketing for decades to come. Rather than abandoning advertising, many successful companies doubled down on their marketing efforts, using innovative approaches to build consumer trust during difficult times. Test your knowledge about this pivotal era in marketing history!

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Celebrity endorsements featuring Hollywood stars
Testimonial advertising featuring 'everyday Americans'
Product placement in popular radio dramas
Colorful billboard advertising along new highways