The Dollar

Seigniorage is not trivial. The perceived safety and desirability US assets is unlikely to be unrelated to this role of the dollar.

Research shows a steady global demand for dollar debt issues, which lowers normal borrowing costs, and also a flight-to-safety benefit.
-see background information here

Had to swallow hard over the "substantially." See url below for details.
-see background information here

Not a good question. Not clear what "substantially " means. Sign is probably positive, but also probably small.

The advantage is that the gov and business can borrow short-term at slightly lower rates. Does not rise to the level of "substantial".

The U.S. government pays its debts and maintains low inflation. This is good for Americans. Sometimes a high dollar reduces exports,however.

I mildly agree with this statement, but the word "substantially" in "substantially better off" is not supported by evidence.

rarely mentioned example, foreign global banks start each day structurally short of dollar funding, US banks don't + Fed can help US banks

Probably better off, but not substantially (e.g., seigniorage is on the order of 0.1% of annual GDP).
-see background information here

The faith n the US economy that drives the central role of the dollar in the international economy if one of our great assets.

US citizens enjoy some net benefits from the dollar status, but these benefits are not likely to be substantial.
-see background information here

Currencies seem less relevant than they used to be. But uninformed.

Seigniorage is great, but it's small potatoes. US may have more monetary policy freedom. "Substantial" may be overstatement.