Point is when government buys it does not really follow good news. It acts on opposite. You should think as you are a government and you know that economy is screwed up. The only thing to you to manage is make other people do not notice. So as a government it is in your best interest to make things look ok. Government could not create jobs, could not fix unemployment, could not cut debt, could not prevent foreclosures but it can make stock market looks like these things do not exist.