The RBA marks down the neutral cash rate again
In figures released from last week’s Statement on Monetary Policy, the RBA has revised down its average estimate of the nominal neutral cash rate from 2.9% in February to 2.7% in May, where the neutral rate is what the RBA will steer the cash rate towards if it can successfully return inflation back to the 2½% target.
The May revision followed an unprecedently large downward revision from 3.6% in November to 2.9% in February, where the RBA made similarly large downward revisions to its historical estimates of the neutral rate as far back as the early 2010s (past post-COVID vintages of RBA staff estimates averaged around 3½% through successive revisions).
At the same time, uncertainty around the estimated neutral rate – as approximated by the difference between the highest and lowest estimates of the neutral rate – has ballooned from 2.7pp to 3.2pp, which is a much higher sustained level of uncertainty than for any past RBA calculations of the neutral rate.
The RBA estimates of the neutral rate, which are currently derived from seven different approaches, contrast with surveyed economist estimates of the neutral rate, which the RBA now adds to its chart of staff calculations.
That is, as at May, the median economist estimate of the neutral rate was unchanged at 3.5%, having held around that level for more than a year now.
The low average staff estimate of the neutral rate also contrasts with Deputy Governor Hauser’s remark late last year that the neutral rate was probably around 3½-3¾%.
More interestingly, the low average rate does not seem to gel with the RBA’s May updated economic outlook, which forecasts that underlying inflation will settle at 2.6% for the next couple of years based on assumed market pricing that has the cash rate falling to 3.2%.
This outlook seems inconsistent with the neutral rate calculations, in that if the neutral rate is actually 2.7%, then the higher assumed cash rate over the entire forecast horizon implies persistently tight monetary policy that would presumably see underlying inflation edge below the 2½% midpoint (although the RBA’s MARTIN macroeconometric model estimates that the cash rate has a gradual impact on inflation, the RBA’s separate DINGO – yes, you read that right – DSGE model incorporates a more immediate effect).
All this raises the possibility that RBA policy-makers are not taking the downwardly-revised staff estimate of the neutral rate at face value, which means that it may have less influence on how far the RBA cuts rates, assuming that inflation continues to slow over the next year and that the fallout from the US-led trade war is manageable.

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