To say that the word of the United States is worthless is to ignore reality.
As for the word of the United States, I'm guessing you've never been to an Indian reservation.
Look at it this way if you must: the rich and the powerful, in the US, have vast amounts of wealth stored in USD and USD-demoninated instruments. It is therefore in their best interests to preserve the value of the USD, or at times slightly inflate it.
The risk of your second paragraph cuts both ways. If the euro collapses tomorrow, you might need only US$13 to pay that debt.
You're suggesting that US elites are systematically long dollars and have the power to control the value of the currency, including overcoming coordination problems. If that were true, we'd be seeing dollar deflation. Instead, we've seen about eight decades of uninterrupted inflation. This means one or both of your premises are wrong. I suspect both.
As for the "risk", I didn't mean to suggest that USD is particularly risky, certainly not more risky than EUR. I was just pointing out that the USG isn't "backing" USD even in the sense of Bretton Woods.
I disagree. There are a number of benefits to inflation - particularly to those who have large amounts of debt on the books. Mortgaged real estate benefits greatly. Interest rates go up. Who stands to gain the most by decreasing the real value of loans and increasing interest rates?
> I was just pointing out that the USG isn't "backing" USD
In the abstract, nobody can back anything, because all you're relying on is their word. You could back a currency with a precious metal, but even that assumes the metal is intrinsically worth something (which has compelling arguments both ways).
The USG backs the USD fundamentally because they have power over the USD. They could instantly crush the value of the dollar if they chose to. Personally, I believe that if/when that happened, we'd have a great deal more to worry about than our wallets.
Creditors compensate by increasing interest rates on new loans, but that's, properly speaking, a response to expectations of future inflation, not a cure for past inflation.
> nobody can back anything
I can't tell if you're actually unable to understand the distinction between reserve-backed currencies and fiat currencies like the current dollar, or if you're intentionally bringing up irrelevancies to try to confuse the discussion. Your unwarranted personal attack earlier in the thread makes me want to assume the latter. In either case, shut the fuck up, because whether your ignorance is faked or not, you're not contributing to the conversation. You're just being an asshole.
Second, the US government doesn't give its word that dollars are usable for anything other than paying dollar-denominated debts to people inside its jurisdiction. If you owe somebody in the US €100, that's currently US$130.50. But if the dollar collapses tomorrow, you might need US$1300 to pay that debt, even to somebody in the US.
The US government has not given its word that you can exchange those US$130.50 for €100 tomorrow, or for anything else, except for debts already denominated in dollars. It doesn't even require that businesses allow you to buy things with any particular currency (this is a FAQ on the Fed's web site) — just that they accept payment for debts already contracted.