In this April 4, 2015, file photo, Iranian and U.S. banknotes are on display at a currency exchange shop in downtown Tehran, Iran. Iran's currency is continuing its downward spiral as increased American sanctions loom, hitting a new low on the thriving black market exchange. The Iranian rial fell to 112,000 to the dollar on Sunday, July 29, 2018, from 98,000 to $1 on Saturday. (AP Photo/Vahid Salemi, File)
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