Ruqayyah Snyder
Inflation is an essential economic indicator that measures the rate at which prices for goods and services rise over time. In Australia, the primary measure of inflation is the Consumer Price Index (CPI). The Australian Bureau of Statistics (ABS) calculates the CPI by collecting price data for thousands of items across various categories, including food, energy, education, housing, transport, and healthcare. The CPI measures the prices paid by households for the goods and services they consume during a given period, such as a month or quarter. It captures changes in the prices of goods and services commonly purchased by households, providing a representative basket of goods and services. The ABS also employs other methods to measure inflation, such as the Trimmed Mean Measure (TMM) and the Weighted Median, which help identify underlying trends and provide insights into the overall economic environment. Inflation measurement is critical for economic analysis and decision-making, enabling policymakers, businesses, and consumers to make informed choices for a stable and prosperous economy.
| Characteristics | Values |
|---|---|
| Measure of inflation | Consumer Price Index (CPI) |
| What does CPI measure? | Household inflation |
| What does CPI include? | Statistics about price change for categories of household expenditure |
| How often is CPI updated? | Monthly |
| What is the price change measured against? | A particular measurement period (e.g. month or quarter) |
| What is the basket of goods and services? | The goods and services consumed by households during the measurement period |
| How is CPI calculated? | As the annual percentage change in the cost to the average consumer of acquiring a basket of goods and services |
| CPI in March Quarter 2025 | Rose 0.9% |
| CPI over 12 months to March Quarter 2025 | Rose 2.4% |
| Categories with most significant price rises in March Quarter 2025 | Housing (+1.7%), Education (+5.2%), Food and non-alcoholic beverages (+1.2%) |
| Categories with price decreases in March Quarter 2025 | Recreation and culture (-1.6%), Furnishings, household equipment and services (-0.9%) |
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What You'll Learn
The Consumer Price Index (CPI)
The CPI does not include all goods and services; instead, it focuses on a representative basket of goods and services that Australian households commonly consume and spend the most on. This includes categories such as food and energy prices, education, housing, transport, and healthcare. The prices collected are then weighted and adjusted according to their priority in household expenditure. For example, rents in the CPI measure the actual rents paid by all types of households, including new and existing renters, rather than advertised rents, which can be more volatile.
The data is then used in an inflation calculation to find the overall index. The CPI is published quarterly, with a reduced price survey conducted monthly to supplement the quarterly data. The quarterly CPI measure is considered more reliable as it measures all consumer prices, while the monthly measure provides more timely insights on price changes.
The Trimmed Mean Measure (TMM) is another method of measuring inflation. It aims to provide a more stable overview by excluding the most extreme price movements and focusing on the central tendency of price changes. The TMM measures changes in the upper and lower tails of the CPI, which usually incorporate the highest and lowest 15% of price changes. The ABS then averages the remaining price changes to calculate the TMM.
Inflation measurement is critical for economic analysis and decision-making. By monitoring and understanding inflation, policymakers, businesses, and consumers can make informed choices that contribute to a stable and prosperous economy. Inflation is an essential economic indicator that impacts everyone, affecting loan rates, personal consumption expenditures, and other elements of everyday life.
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Trimmed Mean Measure (TMM)
In Australia, the primary method of measuring inflation is the Consumer Price Index (CPI). However, the country also uses the Trimmed Mean Measure (TMM) as a secondary method.
The TMM is an alternative approach to measuring underlying inflation, sometimes referred to as "core inflation". It was first proposed by Bryan and Pike in 1991 and further developed by Bryan and Cecchetti in 1994. The measure focuses on the central tendency of price changes by deliberately excluding the most extreme price movements. The aim is to provide a more stable measure of inflation and how it changes over time. By removing the impact of volatile price changes that result from temporary factors, such as sudden, unexpected disruptions to supply chains or natural disasters, the TMM aims to offer a clearer overview and identify underlying trends and causes of inflation.
The TMM measures the changes in the CPI's upper and lower tails, typically incorporating the highest and lowest 15% of price changes. The Australian Bureau of Statistics (ABS) then averages the remaining price changes to arrive at the TMM. This approach aligns more closely with the rate of inflation experienced by Australian households, as measured by the CPI.
The TMM is calculated using a weighted average of the percentage change from the middle 70% of the distribution of price changes. The distribution is ordered from lowest to highest, and the weights of the components in the CPI are taken into account. This method ensures that the TMM is not excessively influenced by large price changes, either increases or decreases, in individual items.
The TMM provides valuable insights into the medium-term inflationary trend, complementing the CPI. It is useful for assessing the health of the Australian economy and is utilised by important users of the CPI, including the Reserve Bank of Australia (RBA), researchers, and economists.
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Wage growth
In Australia, the primary tool for measuring inflation is the Consumer Price Index (CPI), which captures changes in the prices of goods and services commonly purchased by households. The CPI does not include all goods and services but focuses on a representative basket of goods and services. The Australian Bureau of Statistics (ABS) collects data from thousands of retail outlets and service providers across the country to determine the price movements of these items.
Real wages are calculated by subtracting the CPI from the WPI. Increases in real wages allow households to increase their consumption or improve the quality of their consumption, positively impacting their well-being. Conversely, declining real wage performance negatively affects households as pay rises fail to keep up with the price of goods and services. For example, despite wage growth of 3.5% over the past year, a full-time worker on average earnings has lost around $8,000 in living standards over three years due to rising prices and interest rates.
The largest industry contributors to quarterly wage growth vary by quarter. For example, in the December 2024 quarter, healthcare and social assistance (+0.6%), manufacturing (+1.0%), and construction (+0.7%) were the largest contributors. In contrast, the contribution from enterprise agreements to wage growth in the December 2024 quarter was almost halved compared to the previous year.
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Exchange rates
The Australian dollar is highly sensitive to shifts in commodity prices, inflation, and global demand. When inflation rises or falls, the exchange rate tends to adjust accordingly. For example, when inflation is high, a currency's buying power is reduced, and goods become more expensive, leading to reduced investor interest. Conversely, when inflation is low, more money flows into the country, increasing the currency's buying power and improving its exchange rate.
Central banks play a crucial role in managing inflation and exchange rates through monetary policy tools like interest rate adjustments. Interest rates can influence exchange rates, and countries must carefully balance the two. Low-interest rates can spur consumer spending and economic growth, positively influencing currency value. However, if consumer spending increases to the point where demand exceeds supply, inflation may occur.
Political stability is also essential in the relationship between inflation and exchange rates. Stable political environments attract foreign investment, strengthening the local currency and potentially reducing inflationary pressures. On the other hand, political instability can lead to currency depreciation and higher inflation as investors seek safer options.
In the case of Australia, the floating exchange rate regime in place since 1983 has been beneficial. It has provided a buffer against external shocks, particularly shifts in the terms of trade, allowing the economy to absorb them without generating the large inflationary or deflationary pressures seen under previous fixed exchange rate regimes. This flexibility has contributed to a decline in output volatility.
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Government policies
The Australian government uses the Consumer Price Index (CPI) as the primary tool for measuring inflation. The CPI measures changes in the price of a 'basket' of goods and services commonly purchased by households. The Australian Bureau of Statistics (ABS) collects data from thousands of retail outlets and service providers across the country to determine price movements. The CPI does not include all goods and services; it focuses on a representative basket of goods and services. Some items, such as government services and financial products, are excluded from the CPI.
The ABS also uses the Trimmed Mean Measure (TMM) to measure inflation. The TMM focuses on the central tendency of price changes by excluding the most extreme price movements, aiming to provide a more stable measure of inflation over time. The TMM measures changes in the upper and lower tails of the CPI, which typically include the highest and lowest 15% of price changes. The ABS then averages the remaining price changes to calculate the TMM.
In addition to the CPI and TMM, the ABS uses other methods to measure inflation, including the Analytical Series of CPI and the Weighted Median. These additional measures provide policymakers with a closer insight into the overall economic environment and help them make informed decisions that contribute to a stable and prosperous economy.
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Frequently asked questions
The Consumer Price Index (CPI) is the primary tool for measuring inflation in Australia.
The CPI measures the change in the retail price of a fixed basket of goods and services that Australian households commonly purchase and consume.
The Australian Bureau of Statistics (ABS) collects price data for thousands of items across various categories, including food, energy, education, housing, transport, and healthcare. These prices are then weighted and adjusted according to their priority in household expenditure. This data is then used in an inflation calculation to find the overall index.
Inflation measurement is critical for economic analysis and decision-making. By monitoring and understanding inflation, policymakers, businesses, and consumers can make informed choices that contribute to a stable and prosperous economy.
