Right now, a sustainable deficit would be around $460 billion. The actual deficit is bigger than that. But according to new estimates by the budget office, half of our current deficit reflects the effects of a still-depressed economy. The “cyclically adjusted” deficit — what the deficit would be if we were near full employment — is only about $423 billion, which puts it in the sustainable range; next year the budget office expects that number to fall to just $172 billion. And that’s why budget office projections show the nation’s debt position more or less stable over the next decade.