The 12-month average rate4 overcomes this volatility by comparing average Harmonized Indices of Consumer Prices (HICPs) in the latest 12 months to the average of the previous 12 months. This measure is less sensitive to transient changes in prices. The monthly rate compares price levels between the two latest months. Although up-to-date, it can be affected by seasonal and other effects.
The impact of a particular component measures the change in the headline inflation due to the inclusion of that component in the HICP. The impact takes account of both the weight and whether the inflation for that component is higher or lower than the all-items inflation rate.
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