Consumers Price Index

CPI is the quarterly measure of the changes to the prices of consumer items purchased by households, which gives a measure of inflation.

Consumers Price Index

Consumers Price Index - December quarter 2017


The Consumers Price Index (CPI) is an indicator or measure of prices changes. It is a fixed weighted average of price relatives and is computed using the Laspeyres price index formula. The current weighting pattern is based on the 2005 Household Expenditure Survey (HES), which was carried out in  2005/06. The HES information was used to select the 'basket', which is the commonly used term for the goods and services prices for the purpose of compiling the CPI.

Key facts

Quarterly change
In the December 2017 quarter compared with the September 2017 quarter:
  •  The Consumer Price Index(CPI) All Groups decreased by 0.5 per cent
  •  Transport showed a decrease of 1.7 per cent
  •  Household operations decreased by 1.3 per cent
  •  Housing group decreased by 0.22 per cent
  •  Food and Miscellaneous group decreased by 0.03 per cent
  •  Tobbacco & Alcohol groups prices rose by 0.41 per cent
  •  Apparel group increased by 0.08 per cent
  •  The underlying CPI decreased by 0.2 per cent
Annual change
From the December 2016 quarter to the December 2017 quarter:
  • The consumer price index(CPI) increased by 0.4 per cent
  • Underlying CPI also made minimal decreased by 0.5 per cent

CPI Graph3 201704

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Information about CPI

The Consumer Price Index covers price changes of the basket of goods and services consumed by all households on Rarotonga (the main island).

The base year is 2006. Prices are collected for 205 items and from selected outlets around Rarotonga. Individual prices are combined using weights from the Household Expenditure Survey (HES) conducted in 2004/5. The HES information was used to select the basket of goods and services.

The inclusion of an underlying measure is a recent improvement and it is published at the same time as the CPI. The underlying measure excludes items of a highly volatile nature, items that are subject to policy changes.

It excludes all locally produced fruit, vegetables, meat and fish; international airfares; mortgage interest, government rent, postal and telecommunication charges, electricity charges; tobacco and alcohol; petrol and diesel.

The CPI is computed using the Laspeyres price index formula.


pdfCPI: December quarter 2017

xlsxCPI: December quarter 2017 - Tables