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 The CPI(A), CPI(B) and CPI(C) respectively cover some 50%, 30% and 10% of households in Hong Kong. The monthly household expenditures (in HK$) of these groups in the base period (i.e. October 2009 - September 2010) were $4,500 - $18,499, $18,500 - $32,499 and $32,500 - $65,999 respectively. Taking into account the impact of price changes since the base period, the monthly household expenditure ranges of the CPI(A), CPI(B), and CPI(C) adjusted to the price level of 2012 are broadly equivalent to $5,000-$20,500, $20,500-$36,000 and $36,000-$72,900 respectively, and that of the Composite CPI is broadly equivalent to $5,000- $72,900. The Composite CPI is compiled based on the expenditure patterns of all these households taken together. |