The Consumer Price Index (CPI) is based on the price of a "basket" of goods and services and is used to measure change in this price over time. The content of the basket is determined through the ABS Household Expenditure Survey.
The CPI measures price change relative to the base year 1989-90, for which the index figure is set to 100. Prices are collected each quarter from selected retail outlets and through monitoring marked prices and advertised "special offers". For more information, refer to Consumer Price Index, Concepts, Sources and Methods, (cat. no. 6461.0).
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