" That amount of money is now big enough to count as a constant threat to market stability, currency stability, etc." I'm not sure what do you mean by market s

" That amount of money is now big enough to count as a constant threat to market stability, currency stability, etc." I'm not sure what do you mean by market stability but I doubt very much about the currency stability thing. The USA government (Fed included there) can issue or tax money whenever they want and have total control over the monetary economy. For comparison's sake, the FED quantitative easing program was about $4.5 trillion