But if you want oil and you have the machine that prints $ you don't have to actually pay for the oil - you are buying it with treasury debt. And since the pro

But if you want oil and you have the machine that prints $ you don't have to actually pay for the oil - you are buying it with treasury debt. And since the producer can only sell oil in $ they have no choice but to lend to you - so oil in $ and owning the $ machine gives you a certain advantage over having to actually export somethign to balance our payments