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The Trillion Dollar Ad Campaign
The Trillion Dollar Campaign was launched in 2009 to raise awareness of "the growing problems of hyperinflation in Zimbabwe and increasing restrictions on free speech by the government". The campaign repurposed Zimbabwean banknotes as printing paper for outdoor advertising. "The Zimbabwean Dollar had reached the point where the face value of many banknotes was less than the value of the paper itself" (http://bit.ly/Jw5PwS).