Recent analysis suggests that the official inflation figures in Australia may be overstating the actual increase in consumer living costs, as changes in household behavior are not fully captured by the Consumer Price Index (CPI). The Reserve Bank of Australia (RBA) and the government are pursuing further interest rate hikes to bring inflation back within the target range of 2 to 3 percent, but questions remain about how accurately the CPI reflects real consumer experiences.
Economists have long recognized the substitution effect, where consumers respond to relative price changes by shifting their spending toward less expensive alternatives. For example, if beef prices rise sharply while chicken prices remain stable, households tend to buy less beef and more chicken. While the Australian Bureau of Statistics (ABS) annually adjusts CPI weights to account for such changes in spending patterns, recent shifts in consumer behavior may be larger and more complex than previously accounted for.
Two notable areas illustrating this gap are tobacco and electricity. Official CPI data includes the rising cost of cigarettes, which have reached prices above $50 per pack. However, the ABS estimates that 70 to 80 percent of tobacco consumption now comes from illicit sources, where prices can be significantly lower—sometimes less than $20 per pack. This implies that many smokers have effectively experienced price decreases, contrary to what the CPI indicates. Some analysts estimate that this distortion alone may have caused headline inflation to be overstated by about 0.3 percentage points annually over the past five years.
Similarly, changes in electricity consumption patterns are not fully reflected in official inflation measurements. A growing number of Australian households—around 40 percent—have installed solar panels, with over 5 percent also using batteries to store energy. These households increasingly generate their own electricity, reducing or even eliminating their need to purchase power from retailers. However, the CPI only measures electricity prices paid to providers, thereby missing the declining effective cost to consumers producing their own energy. As a result, inflation related to electricity costs may also be overstated.
These examples are part of a broader trend where consumers adapt to rising prices by altering what they buy and how they live. Shifts include increased adoption of electric and hybrid vehicles, greater use of public transport, and changes in housing arrangements, such as multiple household formation in response to rental costs.
The CPI’s role is crucial because it influences monetary policy decisions. The RBA has signaled intentions to raise the cash rate to 4.85 percent, a level last seen in 2008, in an effort to quell inflation. However, with monetary tightening already substantial, further rate increases may slow economic growth and push unemployment above 5 percent in the coming year. The ABS plans to update CPI weights in February, likely reflecting these evolving consumption patterns, which could help temper measured inflation moving forward.
As Australia navigates these economic challenges, analysts emphasize the importance of considering both the official data and underlying shifts in consumer behavior when evaluating inflation and setting policy.