Sector Transactions
Typically national accounts are sectorized, i.e. separate accounts are compiled for distinct industry output sectors such as manufacturing, agriculture, and different services; economic sectors such as market and non-market sectors; and institutional sectors such as the public sector, the private sector and households. Thus it is usually possible to obtain measures of the gross output for different sectors of the economy.
The transactions between different sectors who purchase inputs and sell outputs to each other are analyzed by national statistical offices using an input-output model. The input-output matrix tables which are calculated every few years by statistical offices provide a means to assess the effect which the growth or decline of particular sectors has on other sectors of the economy, which either buy its products or supply goods and services to them. They show, for each sector, the value of the inputs it purchases from other sectors, and the value of purchases of its gross output by other sectors. Sectoral output is the value sold by an industry to other industries; it excludes that output sold within the industry itself.
Read more about this topic: Gross Output