Economic Definition of NI. Defined.
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Term NI Definition: The abbreviation for national income, which is the total income earned by the citizens of the national economy as a result of their ownership of resources used in the production of final goods and services during a given period of time, usually one year. This is the government's official measure of how much income is generated by the economy. National income, generally abbreviated as NI, is the broadest, most comprehensive of three income measures reported quarterly (every three months) in the National Income and Product Accounts by the Bureau of Economic Analysis.