"the United States is a currency issuer and can never run out of dollars. Greece, in contrast, is a currency user and cannot issue euros at will."

Yes that is correct but when you can't run out of dollar there come a point when it's not the bonds that will default it's the currency in which those bonds are denominated in. When this starts to happen the Central Bank of such country ends up buying most of there own country's Bonds. Presently the FED is buying like there is no tomorrow and is by far the largest buyer.

After 35 years of trade deficit inflation as been exported to countries that produced goods at 90% less that if produced in the US but as those countries such as china start getting richer they will stop exchanging the same amount of this debasing paper against the same amount of labor and value and demand ether that the paper be more valuable.or that they get more = Inflation. When this happens the FEd will have to increase rates.

The US dollar is A) The worlds reserve currency and B) Is not convertible so the fed can act contrary to market force and common sense and lower rates when risk increase as they did prior to the financial collapse or do the opposite until it's currency starts to do the exact opposite and that's when the sh#@^%$$ will hit the fan and the law of gravity will be relearned.