If Iran does not change its policies, it won't be able to integrate into the international community and will become even more isolated than it is now, which likely will have a negative impact on the Iranian people.
You get an image after you act in a film, but it is not necessary that you last long because of that image.
Even the National Bank of Romania doesn't have the huge resources needed to intervene in the market and keep the leu at an acceptable level, because they're drawing close to a floor below which the bank's reserves can't drop. The central bank has to wait for a moment of calm to efficiently conduct i