You see that after attacking to Iraq its price significantly increased, and the peak was when Boush threated to attack Iran.Just that time financial crisis was triggered by high energy price and Bi=ush canceled its plan. You can see why president obama resists any attack against Iran.Because Iran owns Hormoz Strait where 20 percent of world oil should passes from. It means that it can influences supply risk endlessly!! The other point is that Iran has second oil ( after Saudi) and Gas ( after Russia ) reserves of the world. It means that not investing in Iran, of the major supply source, would significantly decrease world energy supply and increase energy price, specially when emerging economies are consuming more and more. The last but not least important is that Nukes is not for using, nobody except US has never use it. Iran wants war for self deffence and in formal reports, US army commander also beleive it. The question is about bargaining power not real war. But inflaming war in Iran, practically burns middle East: there would be war in a region extended from Saudi Arabia to China. Then nobody is in immun of the consequences of such a war.
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from the article: Iran official: We have obtained the S-300 missile system