Four series of Consumer Price Indices (CPIs) are compiled to reflect the impact of consumer price changes on households in different expenditure ranges. The CPI(A), CPI(B) and CPI(C) are compiled based on the expenditure patterns of households in the relatively low, medium and relatively high expenditure ranges. By aggregating the expenditure patterns of all households covered by the above three indices, a Composite CPI is also compiled to reflect the impact of consumer price changes on the household sector as a whole. The year-on-year rate of change in this index is generally taken to reflect overall consumer price inflation. The CPI(A), CPI(B) and CPI(C) respectively cover some 50%, 30% and 10% of households in Hong Kong. The average monthly household expenditures (in HK$) of these groups in the base period (i.e. October 2014 - September 2015) were $5,500 - $24,499, $24,500 - $44,499 and $44,500 - $89,999 respectively, and that of the Composite CPI was $5,500 - $89,999.
To facilitate data users, the 2009/10-based CPI series will continue to be compiled and published until the reference month of December 2016. For information on the 2009/10-based Consumer Price Indices, please refer to Table 52A, Table E501A and Table E502A.