is a 1/2 % reduction in GDP really that big of a deal? why is everyone making so much of a fuss about it?
is a "recession" really that bad if that's all that happens, or is the concern that it will lead to some kind of a chain reaction?
The Fed is buying up treasuries... in other words lending money to the Federal Government. Treasury prices move inversely to interest rates. The government can't afford for interest rates to rise, without the Fed writing down their debt, which other (foreign) investors might see as a default, and will certainly add inflationary pressure. In order to keep rates down, they must buy more and more treasuries. Operation twist has been the Fed buying long term treasuries (to keep the long term interest rate low) using proceeds from selling short term treasuries (on the open market). This would normally drive the short term rates up, but there is plenty of demand from outside investors who want to exchange their long term US debt for bonds that mature sooner.
Unless the winds change, Operation Twist will come to an end in January 2013.
Now think of the market minus this distortion.
The Fed's buying pressure ceases ending the support of the long term prices (they stop holding long term rates down). The selling pressure ceases ending the resistance to the short term prices (they stop the upward pressure to short term rates). Sure, many bond investors will recognize this, but it takes a while to turn a market of that size. The market (in the short term) will drive down the short term rates, spurring cheap, short-term lending/refinancing (the kind of debt that people pay off), but decreasing investor appetite. The market will simultaneously drive up the long term rates, increasing investor appetite but at the cost of interest rate increases on mortgages and other long term loans. However, QE-infinity involves purchasing mortgages, so the hope is that they can at least keep rates low there.
The spiking long term rate will add leverage to force the politicians to fix the cluster-fuck they have created, at the expense of the long term debt markets. This will hurt corporations who rely on financing for construction projects, but many corporations are flush with cash now.
Cash will be king soon, but its reign won't last.