Which innovative retail psychology technique, still used in modern marketing, was FIRST widely deployed in the US War Bonds campaigns of WWII?

During World War II, the US government launched one of history's most successful marketing campaigns to fund the war effort. The War Bonds initiative combined patriotism, celebrity endorsements, and innovative advertising to raise over $185 billion (equivalent to over $2.7 trillion today). This poll tests your knowledge about this remarkable intersection of military history and retail marketing psychology that changed how governments and businesses approached mass consumer campaigns.

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Social proof through celebrity endorsements
Installment plans (making small regular payments)
Limited-time offers with deadlines
Patriotic messaging tied to product benefits