President Obama's fiscal 2011 budget, the Congressional Budget Office (CBO) estimates a deficit that starts at 10.3% of GDP in 2010. It is projected to narrow as the economy recovers but will still be 5.6% in 2020. As a result the net national debt (debt held by the public) will more than double to 90% by 2020 from 40% in 2008.

They do not include deficit spending resulting from the new health-insurance legislation. The revenue numbers rely on increased tax rates beginning next year resulting from the scheduled expiration of the Bush tax cuts. And, as usual, they ignore the unfunded liabilities of social insurance programs,

"Hauser's Law," as I call this formula, reveals a kind of capacity ceiling for federal tax receipts at about 19% of GDP.