1. I doubt that's a significant part. Conventional wisdom is that they've used the petrodollars to buy US Treasuries. If they were to unload them, should put upward pressure on interest rates. Of course, they could simply exchange their dollars for other currency as soon as they are paid for their oil.
2. The real reasons the $USD is weaker are primarily,
Fed is doing the money-pump on steroids. It's inflationary and dilutive to money already in circulation.
The US Gummint has been spending 20% or so more than it takes in tax revenues... annual defict spending. This too is inflationary and dilutive.
The world recognizes the Boomers are going to make large demands on our American financial system, and there is no money for it. Therefore, it is highly likely the Gummint and Fed will print more money. Again, inflationary and dilutive.
And of immediate concern... bailouts of one form or another will end up being funded with print-money... more inflation, more dilution.
Until and unless there are significant changes in how business is done in the US, look for th $USD to weaken further... a LOT further. And no matter how much they crow about how "a weak dollar is good for exporters, good for the people, good for America"... it's NOT. Bad for all of us citizens.
