Let’s put ourselves in the shoes of a mainstream New Keynesian economist for a moment. We would never want to walk in them for long because our self esteem would plummet as we realised what frauds we were. But suspend judgement for a while because to understand what is wrong with the current domination of macroeconomic policy by interest rate adjustments one has to appreciate the underlying theory that is guiding the central bank policy shifts. The New Keynesian NAIRU concept, which stems from work published in 1975 by Franco Modigliani and Lucas Papademos is pretty straightforward. Accordingly, they define an unemployment rate, above which inflation falls and below which inflation rises. So that unique rate (or range of rates to cater for uncertainty of measurement) is the stable inflation rate – where inflation neither falls or rises. They called it the NIRU (“the noninflationary rate of unemployment”). So if the unemployment rate had been stable for some period, yet inflation was continuously declining, then they would conclude that the stable unemployment rate must be ABOVE the NIRU and vice versa. Apply that logic to Australia at present and you will see why the RBA’s claim that the NAIRU (the modern term for the NIRU) is around 4.5 per cent and this is why they are hiking rates in order to stabilise inflation at the higher unemployment rate. They are frauds.