This FACT indicates the increase in percentage change of CPI (consumer price index) from September 2017 to December 2017 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 Hobart has the highest inflation of CPI at 1.007 percent. Whereas Darwin's CPI inflation is considerably lower at 0.274 percent, followed closely by Perth, 0.365 percent.