In response to today’s column, I’m getting a lot of the usual: namely, the claim that low interest rates don’t prove anything, because the Fed has been buying up all the federal government’s debt issue. This is always said with an air of great wisdom; in fact, it’s remarkably foolish, managing to be wrong in three distinct ways.

First of all, it isn’t true that the Fed has consistently been buying a lot of Federal debt issue. Sometimes it has, sometimes it hasn’t; when QE2 stopped, there were widespread predictions that interest rates would spike, but they didn’t — as those of us who have been getting it right predicted.

Second, the idea is conceptually wrong. Asset prices should be determined mainly by the stocks of assets, not the changes in these stocks over short periods. If bond investors lose confidence in federal debt, there’s a huge outstanding stock of that debt for them to try to sell, driving rates up, no matter how much of the new issue the Fed might be buying.

But maybe the killer is this: since when do the kinds of people who worry all the time about deficits believe that the Fed can monetize a substantial part of a large deficit, for four whole years, without any negative consequences? If you believed in the framework these people have, all that expansion of the monetary base should have produced runaway inflation by now, as many of them did in fact predict early in the game. It hasn’t — and no, don’t give me the bit about the government hiding the true rate of inflation. Independent estimates are not significantly different from the official gauges.

Now, back in late 2008, contemplating the situation we were in, those of us who saw it in terms of basic IS-LM macro made a twofold prediction: as long as the economy stayed depressed, interest rates and inflation would both stay subdued despite both large deficits and a huge expansion of the Fed’s balance sheet. There was much scorn for that prediction at the time; how do you think it has looked since?

I have to say, the persistence of the inflationista, eek! deficits! view despite year after year of failure — and the amazing effort put into making excuses for year after year of failure — are a wonder to behold. But then, the point of today’s column was precisely that this is what happens when true believers confront uncooperative reality.