> They won't run out of currency, but the people that use it will run out of faith.

Which is what happens when bond yields go so high that governments default. To my limited understanding, US Treasury bonds are used to determine the 'risk-free rate' of return because the US government reliably pays its bills.

When? At what specific (magic) number does everything come crumbling down? We're at ~36 Trillion today, would 37 Trillion the number that will cause people to run out of faith? I mean that's only one more than we have today, surely people won't run out of faith for one more. So maybe it's 40 Trillion? But come on, we're at 36, people can't possibly give up on the US dollar just an 8% increase. How about 100 Trillion? 500 Trillion? I'm not sure you know how this game is played.