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==Input-output analysis==
In [[input-output analysis]], disaggregated data on gross and net outputs of different economic sectors and sub-sectors is used to study the transactions between them. Thus, for example, a sector purchases inputs from several other sectors and sells outputs to several other sectors. By identifying the quantities of input and output involved, we can estimate what the effect will be of fluctuations in business activity within one sector, or group of sectors on the economy as a whole.
Jack and jill went upto the the hill to fetch a pale of water, jack fell down and jill came tumbling after.
==Criticism==
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