Weights
Article 3
1. Member States shall derive the sub-index and elementary aggregate weights used in the index for year t as follows: (a) Until 31 December 2022, national accounts data for year t-2 and any available and relevant information from household budget surveys and other data sources shall be used to obtain subclass expenditure shares and divide them among the elementary aggregates of the subclass. From 1 January 2023, national accounts data for year t-2, which can be complemented with data from a recent household budget survey and other sources, shall be used to obtain subclass expenditure shares and divide them among the elementary aggregates of the subclass; (b) The expenditure shares for year t-2 shall be reviewed and updated to make them representative of year t-1; (c) The expenditure shares for the elementary aggregates shall be adjusted with an appropriate price change between year t-1 and December of year t-1. 2. Sub-index weights shall be kept constant throughout the calendar year. 3. The weight of an elementary aggregate shall be kept constant throughout the calendar year, unless the list of elementary aggregates within a sub-class is adjusted to reflect significant changes in the target universe. 4. The sub-index weight for any ECOICOP division, group or class shall be equal to the sum of the sub-index weights of its constituent categories. The sum of all sub-index weights at any ECOICOP level shall equal 1 000. 5. The sub-index weight for any subclass shall be equal to the sum of the weights of the elementary aggregates of that subclass. 6. The sub-index weights that relate to non-life insurance shall be derived from aggregate expenditure by households on implicit service charges. 7. Consumption expenditure financed from non-life insurance claims, including payments made directly by the insurance companies, shall be included in the sub-index weights of the relevant ECOICOP categories.