The aggregates of the System of National Accounts (SNA) - for example, value added, income, consumption and saving - are composite values which measure the result of the activity of the entire economy considered from a particular point of view; some aggregates may be obtained directly as totals of particular transactions (e.g. final consumption, gross fixed capital formation and social contributions) while others may result from summing up balancing items for the institutional sectors (e.g. value added, balance of primary incomes, disposable income and saving).