2. How US takes advantage on Petro-dollars? It is a long term loan without interest.

US printed some paper in green, call it dollar. US buys clothes, shoes from other countries with dollars. Other countries then buy food, planes from US with the dollars they earned. That's normal trade. But petrol dollar is different. When US pay dollar for some merchandise from other country, the other country use it as payment in oil trading. Since oil trading needs large amount of money, and dollar is apointed as trading money, huge amount of money are reserved in bank for oil trading. That is petro-dollar. That's how US turns a piece of paper into a long term non interest loan bill.

It is just like US bought a house from Japan for one million dollars. Japan keeps that money in bank as payment for oil. Normally, US has to pay monthly mortgage for that house. But with petro dollar, US enjoys a house almost free. All its cost is the printing of green paper. US doesn't have to pay a penny of interest, as long as the principle. How long is that long term loan? As long as the dollar is appointed oil trading currency.

But now is different, Iran refuses to accept dollars. Japan has to change it into other currency. Theoretically, US has to take it back by merchandise. But US can't. It has a trade dificit already. US also has no enough gold or foreign currency reserve to exchange the petro- dollar back. What it does is to push up the oil price - let other countries to absorb the petro-dollar Japan dumped in the market.

US is a rich country. Partly because it enjoys a long term non interest loan. As oil trading is a big business, what a huge amount of money is locked in it? Or in another word, what a big debt US has had? Since US spent too much and hasn't save something, when others want it to pay the debt, a trick to avoid payment is to push up the oil price. And the next step, as we all see, is to justify an excuse to have a war on Iran.

__________________
If Feds call you and defame my message, it is a tactic of intimidation. They don't want people know the fact.
It also proves what I wrote are truth. They are afraid of it.