Probably pretty sustainable. If the US was financing it by selling off its assets and running out then that would be unsustainable but the US is cranking out assets like nobody's business.
As an example Tesla the company didn't exist 30 years ago. Say you got some shares early you can sell those to the Chinese in return for their widgets. That kind of thing can go on and on.
As an example Tesla the company didn't exist 30 years ago. Say you got some shares early you can sell those to the Chinese in return for their widgets. That kind of thing can go on and on.