Paul Krugman has written two interesting comments (here and here) on my recent “Keynesian Yellen versus Wicksellian BIS” blog. Paul says that the Bank for International Settlements should not be labelled “Wicksellian”, and then asks a typically insightful question: what constitutes “artificially” high asset prices? Some of the discussion below on this point may seem a bit arcane, but in fact it could prove highly relevant for investors.
The crux of the matter is Knut Wicksell’s definition of the (unobservable) natural rate of interest, and its difference from the actual interest rate, as set by the central banks . Krugman says that the Wicksellian or natural interest rate is that which would produce equilibrium between savings and capital investment in the real economy (“full employment”), and therefore leads to stable inflation. If the central banks set the actual rate below the natural rate, inflation will rise, and vice versa.
Since US inflation has generally been stable or falling for years, Krugman infers that the Federal Reserve must have been setting the actual interest rate at about the right level, or even too high (because of the zero lower bound). The further implication is that if current low interest rates are justified, so too are the high asset prices that they have triggered. In that sense, they are not “artificial” . Read more