Corkydog said:
This all being speculation obviously, but I rather think the US would go down fighting. It became obvious to me a while ago that only two things here can happen: America goes to war with China, wins, and all is forgiven, or America goes to war with China, loses, and America as a whole ceases to exist. But I'm pretty sure both sides have big ass missiles, so we could end up taking each other out.
The point being that it would be impossible to call in that debt. It can't be paid off.
I've pondered that question too for a few years. After a while, i noticed that i was looking at the situation from the wrong angle: It isn't even necessary to call in that debt, to trigger a currency reboot.
Case in point: The current US bond-market. The USA can only sustain it's spending spree, by either other govs buying up US-bonds, or by the gov itself buying its own debt. Confused about the second option? Well, it goes like this: The gov issues debt/bonds. Then the fed prints money with which these bonds are bought. Still confused? Okay, here's the shortest desc: If no own borrows the US cash anymore, then the US just prints the dollars it needs for spending.
At this point, a short reminder on what fiat currency is: Fiat money value is trust in the issuer of the money. It has a value, because people believe that it has that value. To put it really simple: The dollar is worth as much as A) There are dollars, and B) as people, corps and other govs trust the US in how it handles money.
So, how reliable and trustworthy would you rate a currency issuer, that acts as if it's own money doesn't apply to itself, by just printing whatever it needs? An issuer that apparently has no mid-term exit strategy out of its massive deficit spending? How would you rate some guy who is overindebted, broke, yet still buying hookers and icecream en masse, and who then proposes that you trust the money which that guy issues?
If you were quite dependent on that maniac, and would have a big stake in his currency, you'd of course not want to immediatelly let all this stuff go down the toilet. However, you would want to carefully get out of business with this financial black hole. And that is exactly what has been happening on the markets recently: REAL investment in US bonds (investment not by the fed itself) slowed down (who wants those shitty 2,5% interest rates anyways? US bonds are so unattractive and toxic now, that the only one who would really want them, is the US itself). Investment in other stuff, especially precious metals, booms.
So, "the world" is already retreating from the dollar. It may not be an outright panic, because a panic isn't desired at this point. But what if something goes wrong with this careful retreat? What if in such an explosive situation, some critical event happens, and the retreat escalates? Then the dollar will go down the toilet... and it will have happened without that debt having been called in - rather, people would just have decided "The dollar sucks".