Today, I want to discuss the challenges the Reserve Bank of Australia (RBA) faces in cutting rates. To do this, I’ll explore our model of Australian short-term interest rates, and how its components interact. A key focus will be the relationship between inflation and unemployment, and how this relationship makes it particularly difficult for the RBA to now lower rates.
Our model of the Australian cash rate is robust, explaining just under 90% of the monthly variation in the cash rate since the 1990s, when the cash rate was first introduced. The model’s components include core inflation (not headline inflation), unemployment, and inflation expectations.
Interestingly, statistical tests show that unemployment is even more important than inflation when it comes to predicting what the RBA will do with the cash rate. This is because of the strong, leading relationship between Australian unemployment and core inflation.
To illustrate this, I’ve used data from the past ten years up until December, which shows the relationship between unemployment and inflation in Australia. The data reveals a Phillips curve, where inflation tends to fall as unemployment rises. This relationship begins to work appears almost immediately, though there is a slight delay of about 3 to 4 months before its full effect is felt.
We look at the data from 2014 to the end of 2024. When unemployment is around 4%—which is where it has been for the past few months—we can predict that core inflation should be around 3.7%. Currently, core inflation is 3.5%, which aligns closely with what we would expect given the unemployment rate. This suggests that the current level of inflation is consistent with current unemployment levels.
Unemployment vs Inflation
2014 to 2024
However, the RBA’s target inflation rate is between 2 and 3%, with a specific target of 2.5%. To achieve this target, unemployment would need to rise from its current level of 4% to around 4.6% or 4.7%. Historical data, such as from 2021, shows that with an unemployment rate of around 4.6%, inflation can be brought down to 2.5%. Therefore, to reduce inflation to the RBA’s target, the unemployment rate would need to increase slightly—though not drastically. If unemployment were allowed to rise to around 4.6%, it would create enough excess capacity in the economy to put downward pressure on inflation, which would take about 3 to 4 months to materialise.
If the RBA were able to allow this rise in unemployment, inflation would decrease to around 2.5%, and the RBA could cut rates. Current rates are at 4.35%, and under this scenario, we could expect them to drop to the low 3.0% range perhaps even lower. This would represent a fall of around 100 basis points from current levels.
Unfortunately, the situation is complicated by fiscal policy. The current Treasurer, Jim Chalmers, has been expanding employment in sectors like the National Disability Insurance Scheme (NDIS) and other areas of the public service. This fiscal stimulus is preventing unemployment from rising to the level needed for inflation to fall. As a result, unemployment remains stuck at around 4%, and inflation remains too high for the RBA to cut rates.
In terms of job vacancies and other labour market indicators, we would have expected unemployment to rise higher by now. However, Treasurer Chalmers is committed to keeping unemployment low ahead of the election, which is why we find ourselves in this position.
The government’s fiscal policy, aimed at maintaining a low unemployment rate, is preventing the necessary adjustment to bring inflation down.
If I input the current levels of inflation, unemployment, and inflation expectations into our model, the estimated cash rate should be 4.45%. This is 10 basis points higher than the current cash rate of 4.35%.
The Australian Government seems intent on maintaining the unemployment rate at 4% ahead of the election. If it does so, Inflation will remain too high for the RBA to cut rates.
