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Whenever theres a discrepancy between official rates and black market rates, corruption thrives. By manipulating foreign exchange, the Iranian central bank can divert the difference in rates to fund other projects, put another way, if foreign companies and correspondent banks pay the official exchange rate in their business with Iran, they will be paying six times as much in dollars. Literally, that means more than 83 percent could go to the Revolutionary Guards, while only 17 percent goes to legitimate purposes.