Which innovative marketing technique used for selling WWII war bonds was revolutionary at the time but has become standard practice in modern retail product advertising?

During major conflicts of the 20th century, governments needed innovative marketing strategies to fund war efforts. War bonds represented one of history's most successful product marketing campaigns, combining patriotism with retail strategy. This poll tests your knowledge about how military history intersects with retail marketing innovation and how these historical campaigns influenced modern product advertising techniques.

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Celebrity endorsements from Hollywood stars and sports heroes
Loyalty programs with tiered rewards based on purchase amounts
Geotargeted advertisements based on regional demographics
Interactive digital displays showing product benefits