4a317c29_lian_Broadcasting_Corporation___Definition
[Term] Consumer price index [Definition] 
Measures the inflation in the price of goods and services. Important to the budget because higher prices mean more GST revenue, although they also mean higher increases in government payments indexed to CPI and higher costs for government purchases.
Budget 2014: Deficit tax may raise a lot less than Treasury forecasts says analyst - ABC News (Australian Broadcasting Corporation)
Definition