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In contrast, an '''endogenous variable''' is a variable whose value is determined by the model. An '''endogenous change''' is a change in an endogenous variable in response to an exogenous change that is imposed upon the model.<ref name=Mankiw/>{{rp|p. 8}}<ref name=Chiang/>{{rp|p. 8}}
In [[econometrics]], an exogenous variable is assumed to be fixed in repeated [[Sampling (statistics)|sampling]], which means it is a [[:wikt:nonstochastic|nonstochastic]] variable. An implication of this assumption is that the error term in the econometric model is independent of the exogenous variable.<ref>{{cite book |first=Jeffrey M. |last=Wooldridge |authorlink=Jeffrey Wooldridge |title=Introductory Econometrics: A Modern Approach |___location=Mason |publisher=South-Western |edition=Fourth |year=2009 |isbn=978-0-324-66054-8 |page=49 |url=https://books.google.com/books?id=64vt5TDBNLwC&pg=PA49 }}</ref>
==Examples==
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