How much did the oil export change during the time of the heads of the central bank? Examining oil export data during different periods of the central bank's presidency shows that the average growth of oil exports in the first and second periods of the Hemati was minus 12 and minus 18 percent; While this average was 70% during the presidency of Salehbadi and 7% during the time of Saif and Farzin. In the oil economies, the control of the currency market is in the hands of the expectations and the actual flow of oil sales and collection. External shocks and the reduction of oil revenues limit the supply of foreign exchange and rapidly raise the exchange rate.