How much deficit reduction would stabilizing federal debt require?
Core argument: The U.S. federal deficit runs about $1.7 trillion a year, or 6% of GDP, double the roughly 3% of GDP — about $800 billion — consistent with holding the primary deficit at an average of zero.
If the United States matches spending to taxes – or in the parlance of economics, if it manages to sustain an average level of zero for the primary deficit. That does not mean a balanced budget. It means borrowing more only to pay the interest owed on what had been borrowed before. Today, this means a current cash deficit of around 3% of GDP – of approximately $800 billion a year. But there is a problem here. Our current deficit is $1.7 trillion a year – not 3% but 6% of GDP – with no prospects of a change in political dynamics that would lead to a reduction to 3%. Nixon economic advisor Herb Stein said: “If something cannot go on forever, it will stop.” But when? And how?

