Most informed laymen believe that the Federal government must borrow in order to spend. They believe that the interest rate on Treasury securities is set in a market for government bonds. The markets impose discipline on the government. Thus their idea is that "fiscal responsibility" will produce low long-term interest rates and tolerable borrowing conditions for the federal government, while "irresponsibility" will be punished by higher, and eventually intolerable, debt service costs.
Accepting this view for the moment, what does the present level of long-term interest rates tell us? As I write, thirty year Treasury bonds are yielding just over four percent -- or just a little more than half their yield a decade back. On the argument just given, this must be an extraordinary success of virtuous policy. It seems that Wall Street has made a strong vote of confidence in the fiscal probity of our current policies. This vote is unqualified, backed by money, contingent on nothing. It therefore represents a categorical rejection, by Wall Street itself, of the CBO's doomsday scenarios and all other deficit-scare stories.
On this theory, it follows that the mandate to reduce the primary deficit to zero by 2015 is unnecessary. Such an action can hardly reduce interest rates -- neither short nor long-term -- which are already historically low.
But wait a minute, some may say. Yes interest rates are low at the moment. But bond markets are fickle, they can turn on a dime. And what then?
Yes, it is possible that interest rates could rise. But the problem with this argument is that it takes us away from the premise of rationality. If bond markets are fickle and arbitrary, who is to say what they will do in response to any particular policy? In the face of irrational markets, the sensible policy is to borrow heavily for so long as they are offering a good deal. One may say that all good things end, and perhaps they will. But if markets are irrational, then by construction you cannot prevent this by "good behavior."
The conclusion from this section is that one cannot logically argue that markets insist on deficit reduction. Either the markets are rationally unworried about deficits, or they are acting irrationally right now, in which case they can hardly "insist" on anything.