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This FACT indicates the increase in percentage change of CPI (consumer price index) from June 2015 to September 2015 in each Australian city. CPI is used as a measure of inflation and consumer goods price differences. It provides insight into which Australian city is the most expensive, and especially how much prices have increased over a given time frame. The data shows that Brisbane has the highest inflation of CPI at .652 percent. Whereas Canberra's CPI inflation is considerably lower at 0.189 percent, followed closely by Sydney and Adelaide, at .277 and .281 percent respectively.