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{{short description|Classification of variables in economic models}}
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In an [[economics|economic]] [[model (economics)|model]], an '''exogenous variable''' is one whose value is determined outside the model and is imposed on the model, and an '''exogenous change''' is a change in an exogenous variable.<ref name=Mankiw>Mankiw, N. Gregory. ''Macroeconomics'', third edition, 1997.</ref>{{rp|p. 8}}<ref name=Varian>Varian, Hal R., ''Microeconomic Analysis'', third edition, 1992.</ref>{{rp|p. 202}}<ref name=Chiang>Chiang, Alpha C. ''Fundamental Methods of Mathematical Economics'', third edition, 1984.</ref>{{rp|p. 8}}
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