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Contribution to GDP growth (national accounts)

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Definition

GDP growth may be broken down into the sum of contributions from its various components: household, general government and non-profit institutions serving households consumption expenditure, investments, changes in inventories and trade balance.
In simple cases, aggregates in current prices for example, the contribution of a component to an aggregate (the GDP for example) is equal to the product of that component's growth rate by its weight in the aggregate on the previous period. With chain-linked volumes at the price of the previous year, a concept of volume according to which the national accounts are published, the previous calculation applies to annual accounts with the growth of the component in chain-linked volume and weight in current prices (the case of changes in inventories is specific). For quartely accounts, the particularities of chain-linking involve that such a calculation gives only an approximation. This one is generally good enough but the obtained contributions are not additive.