In this photo taken on Wednesday, Oct. 24, 2012, a currency exchange 

In this photo taken on Wednesday, Oct. 24, 2012, a currency exchange bureau worker counts U.S. dollars in downtown Tehran, Iran. Iranian authorities have been forced to quell protests in recent weeks over the plummeting value of the country's currency which lost nearly 40 percent of its value against the U.S. dollar in a week in early October. With the U.S. election less than 10 days away, both President Obama and Republican challenger Mitt Romney are cautious about discussing potential compromises as Iran's economy shows signs of increasing strain from economic sanctions that seek nuclear concessions. (AP Photo/Vahid Salemi)
Associated Press
In this photo taken on Wednesday, Oct. 24, 2012, a currency exchange bureau worker counts U.S. dollars in downtown Tehran, Iran. Iranian authorities have been forced to quell protests in recent weeks over the plummeting value of the country's currency which lost nearly 40 percent of its value against the U.S. dollar in a week in early October. With the U.S. election less than 10 days away, both President Obama and Republican challenger Mitt Romney are cautious about discussing potential compromises as Iran's economy shows signs of increasing strain from economic sanctions that seek nuclear concessions. (AP Photo/Vahid Salemi)
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