>>539 (OP)
Saudiarabia depends on oil so does USA, if the price is low USA and Saudiarabia loose billions by selling it under their profitable mark, or they dont sell it, so get no money. Russia droped the oilprices by flooding the market with cheap russian oil and leaving OPEC. Economy is not important, important is how much land, resources and gold you have and how good can you protect it(military) having all this useless dollars, and numbers on bankaccount or bitcoins whatever...is just an illusion.