With respect to the value of Rial, the well known concepts, of Economic terms are miss used in Iranian economic circles, academic or policy making centers. Such confusions have costed too much for Iran economy. Although the points which are made look very conventional and clear, but often seems it is ignored. Therefore we might need to remind few points in this regard: First, the distinction of real and nominal value of Rial are defined. Second, it is made clear that the value of Rial is not a policy goal, but it is an endogenous variable which is determined by economic policy, such as, monetary or fiscal policies. Third, since the oil revenue is very volatile, foreign reserves should be higher than the one in the other typical economies, Fourth, the oil revenue is monopolised by the government, therefore the government could highy influence the value of Rial, just in the short run. Thus, the government is advised not to appreciate nominal or real value of Rial in the short run due to increment in oil prices. (which unfortunately, has been the case in the last two years).