Foreign reserves are kept in whatever currencies are globally recognized and traded because of the size and stability of the domestic economies of the
country, and the widespread global availability of financial instruments in that currency, and a perceived lack of political risk, i.e. exchange
controls, in those currencies.
This applies to euros and dollars equally, so accepting payment in euros versus dollars makes little difference.
If suddently they were to accept only Chadian pesos or whatever, then that would be qualitatively different. But Iran wouldn't do so because nobody
would transact on that basis.
Recall that in a commodity exchange, the most important risk by market participants is honest settlement. If they believe the trades will not be
settled, then they will flee from trading and go somewhere else.
Oil trades are settled with old-fashioned physical delivery. If political or military actions involving Iran make the trades likely to be broken,
then people will refuse from trading on that commodity exchange. (note the previous article is about the Tehran stock market for domestic Iranian
companies, not oil).
Therefore, if Iran were to have a major oil commodity exchange with signficant domestic profitability for Iran, then it would be a moderating force on
Iran's political international position. Why? Because then rich and powerful people in Iran would have an interest in keeping stability and the oil
flowing.






Benanke Part II: Same batty channel, same batty time...stay tuned for more exciting adventures in Federal
Reserve crpytospeak.
Dollar is going to take a major hit if this plays out as feared. 



