They can not, because the enormous amount of money that they printed the last 10 years is not in circulation yet. They can't simply take that back (only very in

They can not, because the enormous amount of money that they printed the last 10 years is not in circulation yet. They can't simply take that back (only very indirectly through ways that are both illegal and would political suicide). The private banks who hold that money now decide when to put it into circulation; the central bank has no power here.