Feds Job

What Feds does? paper money printings, that is why Feds has to watch inflation print more green bill.
Feds has no choice because US$ is so popular in the world, we know OIL US$ in middle east, we know officier bribed US$ in China, we know Cocaine US$ in S. America, many many, Feds really doesn't know how many US$ varieties in the world, what to do is watch the curve of US$ value, print more or less papers.
Does it make sense? it could be a good subject for PhD world economy... tbc