The RBA's recent rate hikes have sparked a unique response from Australians, challenging long-held assumptions about the relationship between monetary policy and labor supply. The International Monetary Fund (IMF) working paper, authored by Mitali Das, Jonathan Hambur, Klaus-Peter Hellwig, and John Spray, reveals a fascinating phenomenon: when the Reserve Bank of Australia (RBA) rapidly increased interest rates in 2022 and 2023, many Australians responded by entering the workforce, taking on additional jobs, or increasing their working hours. This finding directly contradicts the conventional belief that labor supply is largely unaffected by monetary policy.
The study, which spanned from May 2022 to June 2025, analyzed a period of significant monetary policy tightening. The RBA raised the cash rate target by 4.25 percentage points over 13 consecutive rate hikes, providing a unique natural experiment. The authors highlight the high prevalence of variable-rate mortgages in Australia, which are typically indexed to the RBA's policy cash rate, as a key factor in the swift transmission of monetary policy to households.
What makes this finding even more intriguing is the context of a strong labor market. During the period of rate hikes, unemployment was near multi-decade lows, and labor demand was elevated compared to historical tightening cycles. This suggests that the increased labor supply was not just a reaction to higher interest rates but also a reflection of strong underlying labor demand.
The paper's key findings include:
- A 0.4 percentage point increase in the share of individuals working more than one job, equivalent to over 100,000 additional workers.
- A historic high participation rate of 67%, up from the pre-COVID level of 66%.
- A notable labor supply response among highly indebted households, particularly those without children, in response to rising interest rates, not inflation.
- A 'quasi-experiment' setting provided by the federal government's childcare subsidy reforms in 2023, which further supported the link between interest rates and labor supply.
This study challenges the long-held assumption that macro-economic models and central banks' statements reflect, that labor supply is unresponsive to monetary policy shocks. The authors argue that an increase in labor supply following interest rate hikes has significant implications for macroeconomic conditions, potentially dampening the effect on output and amplifying the impact on inflation through wage and price dynamics. Moreover, such responses may have distributional and welfare consequences.
As the RBA continues to navigate the post-COVID economic landscape, this finding underscores the complexity of monetary policy's effects. It prompts a reevaluation of how central banks interpret and forecast macroeconomic conditions, especially in countries with a high prevalence of variable-rate mortgages. The question remains: how will Australians respond to further rate hikes, and what does this mean for the labor market and overall economic outlook?
